crossbill vs Loxia curvirostra

crossbill and Loxia curvirostra both are nouns.

Word	Noun	Adjective	Verb	Adverb
crossbill	Yes	No	No	No
Loxia curvirostra	Yes	No	No	No

As nouns, crossbill and Loxia curvirostra are synonyms defined as:

crossbill and Loxia curvirostra: finch with a bill whose tips cross when closed

crossbill (noun)	Loxia curvirostra (noun)
finch with a bill whose tips cross when closed	finch with a bill whose tips cross when closed