bay lynx vs catamount

bay lynx and catamount both are nouns.

Word	Noun	Adjective	Verb	Adverb
bay lynx	Yes	No	No	No
catamount	Yes	No	No	No

As nouns, catamount is a hypernym of bay lynx; that is, catamount is a word with a broader meaning than bay lynx:

bay lynx: small lynx of North America
catamount: short-tailed wildcats with usually tufted ears; valued for their fur

Other hypernyms of bay lynx include lynx.

bay lynx (noun)	catamount (noun)
small lynx of North America	large American feline resembling a lion
	short-tailed wildcats with usually tufted ears; valued for their fur