You can freely access high quality Bible Lexicons at a number of different websites. The following are among them…

BibleStudyTools.com.
As noted at BibleStudyTools.com, “Bible lexicons provide definitions and meaning of Biblical words found in the original New Testament Greek and Old Testament Hebrew languages of the Holy Bible…” 
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StudyLight.org.
As noted at StudyLight.org, “In linguistics, the lexicon of a language is its vocabulary, including its words and expressions. A lexicon is also a synonym of the word thesaurus. More formally, it is a language’s inventory of lexemes. Coined in English 1603, the word “lexicon” derives from the Greek…”
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Lexilogos.com.
As an online Bible Lexicon, Lexilogos offers some very impressive web-based, interactive search features, but at Lexilogos.com, you will find links to many other Hebrew language-learning resources as well. This is one of those resources in which high-quality list of related resources just goes on and on.
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BibleHub.com.
Beginning from the first verse in the Bible, BibleHub provides an online Bible Lexicon that helps you analyze biblical Hebrew word-by-word and phrase-by-phrase.
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