As nouns the difference between feat and feather
is that
feat is a relatively rare or difficult accomplishment while
feather is a branching, hair-like structure that grows on the bodies of birds, used for flight, swimming, protection and display.
As verbs the difference between feat and feather
is that
feat is (obsolete) to form; to fashion while
feather is to cover or furnish with feathers.
As an adjective feat
is (archaic) dexterous in movements or service; skilful; neat; pretty.