Three letter words are simply words containing three letters.
If you are asking for a list of all three letter words, Webster's Second International contains 1 ,351 of them - too many to list here!
If you have access to a non-Windows computer, copy/paste this into the command line:
grep '^...$' /usr/share/dict/words
If you have a Windows machine, I believe you can download grep for Windows, then find a free plaintext dictionary and have a go at it yourself. There are also text apps that can search with regular expressions, like BBEdit.
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Three letter words ending with I are:chikoileiobipoiski
Some three letter words starting with "s" are:sacsadsagsapsatsawsayseaseesetsewsexsheshysinsipsirsitsixslysobsodsonsopsotsowsoyspaspystysuesumsun
Some three letter words that start with vowels are:aceampapearearkarmarteareatelfemueraergiceI'llimpinkinnionireirkit'soafoakoaroatofforeouroutughumpurnuse
Three letter words that start with V are:vanvatvetvievim
Three words match:HajRajTaj