You will never accomplish any serious exegesis if you remain forever with only a beginner’s lexicon (as Newman’s Dictionary must be judged; it has other limitations as well). There is no other equivalent tool. Louw and Nida’s Lexicon has a different focus altogether. Abbott-Smith is much more limited (though handy enough to carry on vacation). Thayer ought not even be considered since his work is both inaccurate and seriously out of date (it is “pre-papyri”). The only other major lexicon is Liddell