Columba fasciata vs pigeon

Columba fasciata and pigeon both are nouns.

Word	Noun	Adjective	Verb	Adverb
Columba fasciata	Yes	No	No	No
pigeon	Yes	No	No	No

As nouns, pigeon is a hypernym of Columba fasciata; that is, pigeon is a word with a broader meaning than Columba fasciata:

Columba fasciata: wild pigeon of western North America; often mistaken for the now extinct passenger pigeon
pigeon: wild and domesticated birds having a heavy body and short legs

Columba fasciata (noun)	pigeon (noun)
wild pigeon of western North America; often mistaken for the now extinct passenger pigeon	wild and domesticated birds having a heavy body and short legs