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Liddell Scott Greek-English Lexicon is a classic work for those who study Greek. This focuses on classical Greek as a comparison of Biblical Greek.
A Manual Greek Lexicon of the New Testament + Keyed to Strong’s.
Moulton and Milligan – Vocabulary of the Greek NT is a Greek lexicon focusing on the Papyrus Greek.
A classic Greek lexicon useful for every theology student. Note that Thayer was a universalist, so be careful with any word dealing with salvation, and also the Trinity (his definition of “Christ” would seem to doubt Jesus’ deity). Basically the majority of his word definitions are from standard usage in the Greek NT and classical literature, so in theologically charged words, be careful.
A Dictionary of Catechisms from Puritan, Reformed, and several other denominations, such as Baptists, Broadus, Gadsby, Owen, etc.
Trench’s Classic work, Synonyms of the New Testament, is a study of Greek synonyms in the New Testament, showing their similarities and differences.