crested vs topknotted

crested and topknotted both are adjectives.

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

As adjectives, crested and topknotted are synonyms defined as:

crested and topknotted: (of a bird or animal) having a usually ornamental tuft or process on the head; often used in combination

Other synonyms of crested include tufted.

crested (adjective)	topknotted (adjective)
(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
(of a bird or animal) having a usually ornamental tuft or process on the head; often used in combination
bearing an heraldic device