Journal entry in 1835 shows Joseph owned a Greek lexicon.
Joseph Smith, Journal, November 20, 1835, 47, The Joseph Smith Papers website, accessed August 23, 2023
Friday 20th in morning at home: the weather is warm but rainy, we spent the day in translating, and made rapid progress
At Evening, President [Oliver] Cowdery returned from New York, bringing with him a quantity of Hebrew book’s for the benefit of the school, he presented me with a Hebrew bible, lexicon & Grammar, also a Greek Lexicon and Websters English Lexicon.
President Cowdery had a prosperous journey, according to the prayers of the saints in Kirtland