/ow/ as in cow

-ow: allow allowance anyhow avow bowel brow chowder cow cowboy cower coward disallow dowdy dowel drowsy endow endowment flower glower how Howard jowly now nowadays powder power powerful row rowdy shower sow towel tower vow vowel wow

-owd: crowd

-owl: owl fowl growl howl prowl prowler scowl yowl

-own: brown clown crown down downside drown frown gown town renown

-owse: drowse