bow

brow

brown

chow

clown

cow

cowl

crowd

crown

down

drown

fowl

frown

gown

growl

how

howl

jowl

now

ow

owl

plow (US)

pow

prow

prowl

row

scowl

sow

town

vow

wow

allow

avow

blowsy

bowel

bowing

bowser

Brownie

browning

browsing

chowder

clowning

coward

cowboy

cowrie

crowded

disavow

dowager

dowdy

dowel

download

downy

drowning

drowsy

endow

flower

frowning             

glower

growling

growly

howdy

jowly

kowtow

meow

nightgown

owlet

owlish

powder

power

pow-wow

prowess

prowler

renown

rowdy

scowling

towel

tower

trowel

vowels

wowser

yowie

yowling