catcher's mask vs face mask

catcher's mask and face mask both are nouns.

Word	Noun	Adjective	Verb	Adverb
catcher's mask	Yes	No	No	No
face mask	Yes	No	No	No

As nouns, face mask is a hypernym of catcher's mask; that is, face mask is a word with a broader meaning than catcher's mask:

catcher's mask: a mask to protect the face of the catcher in baseball
face mask: mask that provides a protective covering for the face in such sports as baseball or football or hockey

Other hypernyms of catcher's mask include baseball equipment.

catcher's mask (noun)	face mask (noun)
a mask to protect the face of the catcher in baseball	mask that provides a protective covering for the face in such sports as baseball or football or hockey