air, bit, CIA, din, fin, gin, hit, jib, kin, kit, lit, mix, nix, oil, pit, rig, sit, tin, vim, wig, yip, zit
Some three letter words that have an A in the middle are:bagbahbanbarbatbaycabcadcamcancapcarcatcawcaydabdaddamdayeareatfadfanfarfatfaxgabgadgaggalgapgasgayhadhaghamhasHathayjabjamjarjawjaylabladlaglaplawlaymadmanmapmarmatmawmaynabnagnapnaypadpalpanparpatpawpayragrahramranrapratrawraysadsagsapsatsawsaxsaytabtadtagtamtantaptartattaxvanvatwadwagwanwarwaswaxwayyakyamyapyawzap
Some three letter words with a vowel in the middle are:airbowcatdogeatforguthitionjamkitlapmannotourpunquaratsiptapvatwinyewzoo
Some three letter words with F in the middle are aft, off, oft, and eft (a young newt).
And Ant End Ink Inn Ins One
lye dye bye rye wye aye
low now and cow
Some words that have the letter X in the middle are:asexualaxeboxerbuxomcoaxingcoexistDixieepoxiedfixedflexionhexedhoaxinglexismaximmixedmoxienexuspixelpixieproxiessexessixthsixtytaxedTexastoxictoxinvexedvixenwaxen
Some six letter words with FF in the middle are:wafflebafflebufferduffermufflepifflesufferduffelpuffindiffer
There are no six-letter words containing three L's in either the Scrabble dictionary, or Webster's Second International dictionary, (250,000+ words).
Words that have the letter I twice in the middle are skiing and coniine (it's a poison).
Three letter words ending with I are:chikoileiobipoiski
otherashesachesashenochreaphid