Danny Akin, President of Southeastern Baptist Theological Seminary, has recommended the following books for Old Testament word studies.
Brown, Francis. The New Brown-Driver-Briggs-Gesenius Hebrew-English Lexicon. Peabody, MA: Hendrickson, 1979.
Harris, R. Laird, Gleason L. Archer, Jr., and Bruce K. Waltke, eds. Theological Wordbook of the Old Testament. 2 vols. Chicago: Moody, 1980.
Jenni, Ernst, and Claus Westermann, eds. Theological Lexicon of the Old Testament. Translated by M. E. Biddle. Peabody, MA: Hendrickson, 1997.
Koehler, Ludwig and Walter Baumgartner. The Hebrew and Aramaic Lexicon of the Old Testament. 5 vols. New York: E. J. Brill, 1994-2000.