crested vs plumed

crested and plumed both are adjectives.

Word	Noun	Adjective	Verb	Adverb
crested	No	Yes	No	No
plumed	No	Yes	No	No

As adjectives, crested and plumed are synonyms defined as:

crested (adjective)	plumed (adjective)
(of a knight's helmet) having a decorative plume	(of a knight's helmet) having a decorative plume
(of a bird or animal) having a usually ornamental tuft or process on the head; often used in combination	having an ornamental plume or feathery tuft
bearing an heraldic device	having or covered with or abounding in plumes