barn swallow vs chimney swallow

barn swallow and chimney swallow both are nouns.

Word	Noun	Adjective	Verb	Adverb
barn swallow	Yes	No	No	No
chimney swallow	Yes	No	No	No

As nouns, barn swallow and chimney swallow are synonyms defined as:

barn swallow and chimney swallow: common swallow of North America and Europe that nests in barns etc.

Other synonyms of barn swallow include Hirundo rustica.

barn swallow (noun)	chimney swallow (noun)
common swallow of North America and Europe that nests in barns etc.	common swallow of North America and Europe that nests in barns etc.
	American swift that nests in e.g. unused chimneys