chimney swallow vs chimney swift

chimney swallow and chimney swift both are nouns.

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

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

chimney swallow and chimney swift: American swift that nests in e.g. unused chimneys

Other synonyms of chimney swallow include Chateura pelagica.

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