face vs face off

face is a noun but face off is not a noun.

Word	Noun	Adjective	Verb	Adverb
face	Yes	No	Yes	No
face off	No	No	Yes	No

face (noun)	face off (noun)
a vertical surface of a building or cliff
the side upon which the use of a thing depends (usually the most prominent surface of an object)
the striking or working surface of an implement
the general outward appearance of something
status in the eyes of others
impudent aggressiveness
the feelings expressed on a person's face
the front of the human head from the forehead to the chin and ear to ear
the part of an animal corresponding to the human face
a specific size and style of type within a type family
a contorted facial expression
a surface forming part of the outside of an object
a part of a person that is used to refer to a person

face (verb)	face off (verb)
deal with (something unpleasant) head on	start a game by a face-off
present somebody with something, usually to accuse or criticize
oppose, as in hostility or a competition
line the edge (of a garment) with a different material
cover the front or surface of
turn so as to face; turn the face in a certain direction
turn so as to expose the face
be oriented in a certain direction, often with respect to another reference point; be opposite to
be opposite