6-Letter Word-Change one or two letters make a new word

deepen

meeper

meeker

kerfed

“trying” in post #10907 was not a legal play, as it changed three letters. But, it’s been a while.

Playing off “kerfed”:

darker

Dang, I played off it; I should’a caught it.

reared

dreary

ornery

neuron

neuter

neural

laurel

really

larval

valley

valued

dually

allude

duller

mulled