mutton chop vs facial hair

mutton chop and facial hair both are nouns.

Word	Noun	Adjective	Verb	Adverb
mutton chop	Yes	No	No	No
facial hair	Yes	No	No	No

As nouns, facial hair is a hypernym of mutton chop; that is, facial hair is a word with a broader meaning than mutton chop:

mutton chop: facial hair that has grown down the side of a man's face in front of the ears (especially when the rest of the beard is shaved off)
facial hair: hair on the face (especially on the face of a man)

mutton chop (noun)	facial hair (noun)
facial hair that has grown down the side of a man's face in front of the ears (especially when the rest of the beard is shaved off)	hair on the face (especially on the face of a man)
chop cut from a mature sheep