Willow (tree); shallow; fallow; crow; below; harrow; slow; fellow; now; snow; plow; clew; flew; shrew; tow; below.... Need more?
Some words ending in IA are:acaciaariaAsiaciliadementiafuschiamediamilitiasepiasequoiasuburbiatibia
Some words ending with OY are:ahoyalloyannoybatboybeachboybellboyboybuoybusboycloyconvoycorduroycowboycoydecoydeploydestroyemployenjoyenvoyhighboyhomeboyhouseboyjoykilljoylowboynewsboyoverjoypageboypaperboyplayboyploysavoyschoolboysoytallboytomboytoytroyviceroy
ending, ageing, needing
Ado, hello, Toto, Bobo, dodo, go, ho-ho-ho (Santa's big line), Io (an English band), Jo, lo (as in 'and behold!'), Mo (nickname) no, so, to, yo, and zoo are all English words ending with an 'o'.
optimist
AllowArrowAskewBedewBelowBylaw.
Four letter words starting with B and ending with W are blew, blow, brow, and brew.
a 6 letter word ending with a w is borrow.
rainbow
waggishwarmthwarpathwashwashclothwaspishwatchweakfishweakishwealthwherewithwretchwrathwristwatchwhiplashwhitishwhitewashwhooshwhichwithwitchwordsmithworthwreath
chewchowclawcowcrewcrowcurfew
window
No, but in words ending in "W", it often sounds like a vowel.
Jaw Saw Kaw
4 letter words W - M: * warm * worm * whim * wham
Words that end in W include throw, show, bow, and two. Other words ending in that letter are tomorrow and borrow.
Aflow, afterblow, afterglow, glow, aircrew, airflow, airglow.