bacon vs gammon

bacon and gammon both are nouns.

Word	Noun	Adjective	Verb	Adverb
bacon	Yes	No	No	No
gammon	Yes	No	No	No

As nouns, gammon is a hyponym of bacon; that is, gammon is a word with a more specific, narrower meaning than bacon:

bacon: back and sides of a hog salted and dried or smoked; usually sliced thin and fried
gammon: hind portion of a side of bacon

Other hyponyms of bacon include flitch, side of bacon, bacon strip, Canadian bacon.

bacon (noun)	gammon (noun)
back and sides of a hog salted and dried or smoked; usually sliced thin and fried	meat cut from the thigh of a hog (usually smoked)
	hind portion of a side of bacon