Here you will find the books I use for Hebrew Bible word study.

I don’t actually use this one myself, for I have a Dutch – Hebrew bible. In this edition of the Tanach, the First Testament, the Hebrew and English texts stand side by side.
The Koren Jerusalem Bible.

When I am curious about a word, I use this lexicon. 

I find this concordance is very useful, especially when I use it in addition to the aforementioned dictionary. The concordance gives all sites of each Hebrew word stem. Also very nice: the words are coded with Strong numbers.
Concordance of the First Testament

This is where it all started: the Aleph course. I still look into this book regularly. You will find, among other things, all the profound meanings of the 22 Hebrew letters.
Hebrew in Six Days – Aleph Course