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Well there are way more than just 3, but here are some;Friendly LetterInvitation Letter (some say this could be a business type of letter also)Thank you Letter (could be a business letter as well)
You could have probably answered this question yourself with some thought - anyway, here are three words: cabbage, bedface, and baggage,
fhysic energy
Some three letter words that start with I are ion, ice, ire, and imp.
Nuclear energy Natural gas.
Some three letter words that end with "o" are:agoegoduowhowootootwoboopoomooloogoo
Some three letter words beginning with D are:diddogdoediedendindabduodotdigdrydye
Some three letter words that start with vowels are:aceampapearearkarmarteareatelfemueraergiceI'llimpinkinnionireirkit'soafoakoaroatofforeouroutughumpurnuse
Some three letter words starting with "s" are:sacsadsagsapsatsawsayseaseesetsewsexsheshysinsipsirsitsixslysobsodsonsopsotsowsoyspaspystysuesumsun
Three letter words that start with V are:vanvatvetvievim
sadsagsapsatsawsayseeseasetsewsinsipsirsitsissobsodsonsowsoysubsuesumsunshestyskiskyslyspyshy
Some three letter words ending in AT are:batcateatfathatmatpatoatpatratsattatvat