pull a face vs squint

pull a face is not a noun while squint is a noun.

Word	Noun	Adjective	Verb	Adverb
pull a face	No	No	Yes	No
squint	Yes	Yes	Yes	No

As verbs, squint is a hyponym of pull a face; that is, squint is a word with a more specific, narrower meaning than pull a face:

pull a face: contort the face to indicate a certain mental or emotional state
squint: cross one's eyes as if in strabismus

Other hyponyms of pull a face include squinch, wince, smile, frown, glower, lour, lower, screw up, mop, mow, pout.

pull a face (noun)	squint (noun)
	the act of squinting; looking with the eyes partly closed
	abnormal alignment of one or both eyes

pull a face (adjective)	squint (adjective)
	(used especially of glances) directed to one side with or as if with doubt or suspicion or envy

pull a face (verb)	squint (verb)
contort the face to indicate a certain mental or emotional state	cross one's eyes as if in strabismus
	partly close one's eyes, as when hit by direct blinding light
	be cross-eyed; have a squint or strabismus