anil -- the indigo plant or the blue dye obtained from this plant.
There may be others.
envy
Utah
lute
onlyonceomenopenomitoverontoovidovum
spud
Four letter adjectives that begin with the letter f:fairfakefastfinefiveflatfoulfourfreefull
Audi
junk
Four...
zeal.
Snidely Spellbinder wrote a four-letter word that begins and ends with e. With ease.
kick