red-backed sandpiper vs Erolia alpina

red-backed sandpiper and Erolia alpina both are nouns.

Word	Noun	Adjective	Verb	Adverb
red-backed sandpiper	Yes	No	No	No
Erolia alpina	Yes	No	No	No

As nouns, red-backed sandpiper and Erolia alpina are synonyms defined as:

red-backed sandpiper and Erolia alpina: small common sandpiper that breeds in northern or Arctic regions and winters in southern United States or Mediterranean regions

Other synonyms of red-backed sandpiper include dunlin.

red-backed sandpiper (noun)	Erolia alpina (noun)
small common sandpiper that breeds in northern or Arctic regions and winters in southern United States or Mediterranean regions	small common sandpiper that breeds in northern or Arctic regions and winters in southern United States or Mediterranean regions