black-capped chickadee vs blackcap

black-capped chickadee and blackcap both are nouns.

Word	Noun	Adjective	Verb	Adverb
black-capped chickadee	Yes	No	No	No
blackcap	Yes	No	No	No

As nouns, black-capped chickadee and blackcap are synonyms defined as:

Other synonyms of black-capped chickadee include Parus atricapillus.

black-capped chickadee (noun)	blackcap (noun)
chickadee having a dark crown	small brownish-grey warbler with a black crown
	chickadee having a dark crown
	small black-headed European gull
	raspberry native to eastern North America having black thimble-shaped fruit