chimney swallow vs barn swallow

chimney swallow and barn swallow both are nouns.

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

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

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

Other synonyms of chimney swallow include Hirundo rustica.

chimney swallow (noun)	barn 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