Apus apus vs European swift

Apus apus and European swift both are nouns.

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

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

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

Apus apus (noun)	European swift (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