black-capped chickadee vs Parus atricapillus

black-capped chickadee and Parus atricapillus both are nouns.

Word	Noun	Adjective	Verb	Adverb
black-capped chickadee	Yes	No	No	No
Parus atricapillus	Yes	No	No	No

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

black-capped chickadee and Parus atricapillus: chickadee having a dark crown

Other synonyms of black-capped chickadee include blackcap.

black-capped chickadee (noun)	Parus atricapillus (noun)
chickadee having a dark crown	chickadee having a dark crown