visor vs brim

visor and brim both are nouns.

Word	Noun	Adjective	Verb	Adverb
visor	Yes	No	No	No
brim	Yes	No	Yes	No

As nouns, brim is a hypernym of visor; that is, brim is a word with a broader meaning than visor:

visor (noun)	brim (noun)
a brim that projects to the front to shade the eyes	a circular projection that sticks outward from the crown of a hat
a piece of armor plate (with eye slits) fixed or hinged to a medieval helmet to protect the face	the top edge of a vessel or other container

visor (verb)	brim (verb)
	fill as much as possible
	be completely full