pouter vs pigeon

pouter and pigeon both are nouns.

Word	Noun	Adjective	Verb	Adverb
pouter	Yes	No	No	No
pigeon	Yes	No	No	No

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

pouter: one of a breed of pigeon that enlarge their crop until their breast is puffed out
pigeon: wild and domesticated birds having a heavy body and short legs

pouter (noun)	pigeon (noun)
one of a breed of pigeon that enlarge their crop until their breast is puffed out	wild and domesticated birds having a heavy body and short legs
someone with a habitually sullen or gloomy expression