hinge vs butt hinge

hinge and butt hinge both are nouns.

Word	Noun	Adjective	Verb	Adverb
hinge	Yes	No	Yes	No
butt hinge	Yes	No	No	No

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

hinge: a joint that holds two parts together so that one can swing relative to the other
butt hinge: a hinge mortised flush into the edge of the door and jamb

Other hyponyms of hinge include joint hinge, strap hinge, T hinge, tee hinge.

hinge (noun)	butt hinge (noun)
a joint that holds two parts together so that one can swing relative to the other	a hinge mortised flush into the edge of the door and jamb
a circumstance upon which subsequent events depend

hinge (verb)	butt hinge (verb)
attach with a hinge