While not definitive, this page enables you to input any two letters and come up with words currently understood to be related by those as a 2 letter root.

http://www.2letterlookup.com/

Yes, this is a great tool I had in my bookmarks and forgot about. Thanx for posting this one Ronen!!

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Hebrew Character Picker, go here:
https://r12a.github.io/pickers/hebrew/
Am ha-Aretz Translit(Heb to Eng Keyboard), go here:
https://bumba.net/~skaya/hebrew/translit/ahtModified.html
To post in Modern Hebrew, go here: https://www.lexilogos.com/keyboard/hebrew.htm
or here, https://www.branah.com/hebrew
For More Root Searches, go here: http://qbible.com/hebrew-old-testament/ or here: https://www.2letterlookup.com/
Gesenius Heb/Chald Lexicon Online: https://www.tyndalearchive.com/tabs/Gesenius/
Brown/Driver/Briggs 1906 Enhanced Lexicon:http://www.ericlevy.com/revel/bdb/bdb/main.htm
Benner: Ancient Hebrew Lexicon of the Biblehttps://www.ancient-hebrew.org/ahlb/aleph.html
Dictionary of Targumim,Talmud Babli,Yerushalmi, Midrashic Literature Online:
https://www.tyndalearchive.com/tabs/jastrow/
Edenics English to Hebrew Word Tracer Tool: https://www.edenics.net/english-to-hebrew.aspx
Comprehensive Aramaic Lexicon: http://cal.huc.edu/
BAG(now BDAG) Greek-English Lexicon:http://lareopage.free.fr/a&g/main.htm
Arabic/English Lexicon:https://www.tyndalearchive.com/tabs/lane/