chimney swift vs chimney swallow

chimney swift and chimney swallow both are nouns.

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

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

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

Other synonyms of chimney swift include Chateura pelagica.

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