In his book A Christian’s Guide To Critical Thinking, Henry A. Virkler recommends the following books for discovering denotations of words and used in biblical passages and for doing word studies:
Strong’s Concordance
Theological Wordbook of the Old Testament, edited by R. Laird Harris, Gleason Archer, and Bruce Waltke
The New International Dictionary of New Testament
Bullinger’s Critical Lexicon and Concordance
Vine’s Expository Dictionary of Biblical Words
R. B. Girdlestone’s Synonyms of the Old Testament
R.C. Trench’s Synonyms of the New Testament
The Expository Dictionary of Bible Words, by Lawrence O. Richards