European swift vs Apus apus

European swift and Apus apus both are nouns.

Word	Noun	Adjective	Verb	Adverb
European swift	Yes	No	No	No
Apus apus	Yes	No	No	No

As nouns, European swift and Apus apus are synonyms defined as:

European swift and Apus apus: common European bird with a shrieking call that nests chiefly about eaves of buildings or on cliffs

European swift (noun)	Apus apus (noun)
common European bird with a shrieking call that nests chiefly about eaves of buildings or on cliffs	common European bird with a shrieking call that nests chiefly about eaves of buildings or on cliffs