red-backed sandpiper vs dunlin

red-backed sandpiper and dunlin both are nouns.

Word	Noun	Adjective	Verb	Adverb
red-backed sandpiper	Yes	No	No	No
dunlin	Yes	No	No	No

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

red-backed sandpiper and dunlin: 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 Erolia alpina.

red-backed sandpiper (noun)	dunlin (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