Google Books has these free, digitized books completely searchable. Simply open a book, enter a word in the search window, and the search engine will show you the word’s occurrences in that book.
18th Century Cookbooks
The Whole Duty of a Woman, (London). First published in 1701. Free editions available on Google Books: 1707, 1737.
A Collection of Above Three Hundred Receipts, Mary Kettilby, (London). First published in 1714. Free editions available on Google Books: 1714, 1734.
The Compleat Confectioner, Mary Eales, (London). First published in 1718. Free editions available on Google Books: 1742, 1767.
The Cook’s and Confectioner’s Dictionary, John Nott, (London). First published in 1723. Free editions available on Google Books: 1723, 1724.
The Country Housewife and Lady’s Director, R. Bradley, (London). First published in 1727. Free editions available on Google Books: 1732, 1736.
The Compleat Housewife, Eliza Smith, (London). First published in 1727. Free editions available on Google Books: 1739.
The Compleat City and Country Cook, Charles Carter, (London). First published in 1732. Free editions available on Google Books: 1732, 1736.
The House-Keeper’s Pocket-Book, Sarah Harrison and Mary Morris, (London). First published in 1733. Free editions available on Google Books: 1739, 1760.
The Complete Family Piece, M.L. Lemery, (London). First published in 1736. Free edition available in Google Books: 1737.
The Art of Cookery Made Plain and Easy, Hannah Glasse, (London). First published in 1747. Free editions available on Google Books: 1774, 1780, 1784, 1805,
The London and Country Cook, Charles Carter (London). First published in 1749. Free editions available on Google Books: 1749.
English Housewifery, Elizabeth Moxon, (London). First published in 1749. Free editions available on Google Books: 1764.
The Art of Confectionary, Edward Lambert, (London). First published in 1750. Free editions available on Google Books: 1761.
The Prudent Housewife, Mrs. Fisher, (London). First published in 1750. Free editions available on Google Books: 25th Edition.
A New and Easy Method of Cookery, Elizabeth Cleland, (Edinburgh). Free editions available on Google Books: 1755.
A Complete System of Cookery, William Verral, (London). First published in 1759. Free editions available on Google Books: 1759.
The Complete Confectioner, Hannah Glasse & Maria Wilson (London). First published in 1760. Free editions available on Google Books: 1800.
The Experienced English Housekeeper, Elizabeth Raffald, (Manchester). First published in 1769. Free editions available on Google Books: 1769, 1803, 1806.
The Lady’s, Housewife’s, and Cook-maid’s Assistant, E. Taylor, (Berwick Upon Tweed). First published in 1769. Free editions available on Google Books: 1769.
The Professed Cook, B. Clermont, (London). First published in 1769. Free editions available on Google Books: 1812,
The Court and Country Confectioner, Mr. Borella, (London). First published in 1770. Free editions available on Google Books: 1770.
Cookery and Pastry, Susanna MacIver, (Edinburgh, London). First published in 1773. Free editions available on Google Books: 1789.
The Lady’s Assistant, Charlotte Mason (London). First published in 1777. Free editions available on Google Books: 1777, 1787.
The London Art of Cookery, John Farley, (London) First published in 1783. Free editions available on Google Books: 1783, 1785, 1792, 1797, 1800.
The English Art of Cookery, John Briggs, (London). First published in 1788. Free editions available on Google Books: 1788, 1798.
The Complete Confectioner, Frederick Nutt (London). First published in 1789. Free editions available on Google Books: 1790, 1807, 1819.
The Practice of Cookery, Mrs. Frazer, (Edinburg). First published in 1790. Free editions available on Google Books: 1791, 1820.
Every Woman Her Own Housekeeper, John Perkins, (London). First published in 1790. Free editions available on Google Books: 1796.
The Universal Cook, Francis Collingwood and John Woollams, (London). First published in 1792. Free editions available on Google Books: 1792, 1797, 1806.
The New Experienced English Housekeeper, Sarah Martin, (London). First published in 1795. Free editions available on Google Books: 1795.
The Frugal Housewife, Susannah Carter, (Philadelphia). Free editions available on Google Books: 1796, 1822.
The Accomplished Housekeeper, T. Williams, (London). First published in 1797. Free editions available on Google Books: 1797.
Early 19th Century Cookbooks
The Art of Cookery Made Easy and Refined, John Mollard, (London). First published in 1801. Free editions available on Google Books: 1802, 1808.
The New Practice of Cookery, Mrs. Hudson and Mrs. Donat, (Edinburgh). First published in 1804. Free editions available on Google Books: 1804.
Culina Famulatrix Medicinae, Alexander Hunter, (York). First published in 1804. Free editions available on Google Books: 1804.
The Housekeeper’s Instructor, William Henderson (London). First published in 1804. Free editions available on Google Books: 1805.
A Complete System of Cookery, John Simpson, (London). First published in 1806. Free editions available on Google Books: 1806, 1816.
A New System of Domestic Cookery, Maria Eliza Ketelby Rundell, (Exeter). First published in 1807. Free editions available on Google Books: 1808, 1840,
The Female Economist, Mrs. Smith (London). First published in 1810. Free editions available on Google Books: 1810.
Apicus Redivivus; or, The Cook’s Oracle, William Kitchiner (London). First published in 1817. Free editions available on Google books: 1817, 1822, 1823, 1825, 1827, 1836, 1845, 1860,
American Domestic Cookery, Maria Eliza Ketelby Rundell, (New York). Free editions available on Google Books: 1823.
The Art of French Cookery, A.B. Beauvilliers, (London). Free editions available on Google Books: 1827.
Houlston’s Housekeeper’s Assistant, (Wellington, Salop). Free edition available on Google Books: 1828.
The Cook’s Dictionary and Housekeeper’s Directory, Richard Dolby (London). Published in 1830. Free editions on Google Books: 1830.
Seventy-Five Receipts for Pastry, Cakes, and Sweetmeats, Eliza Leslie, (Boston). Free editions available on Google Books: 1830, 1836.
The Cook’s Own Book, N.K.M. Lee, (Boston). Free editions available on Google Books: 1832, 1840, 1842, 1854.
The Complete Economic Cook, Mary Holland, (London). First published in 1836. Free editions available on Google Books: 1837.
A Treatise on Bread and Breadmaking, Sylvester Graham, (Boston). Free editions available on Google Books: 1837.
The Virginia Housewife, Mary Randolph, (Baltimore). First published in 1838. Free editions available on Google Books: 1838.
The Good Housekeeper, Sarah Josepha Buell Hale, (Boston). Free editions available on Google Books: 1839.