brim vs vizor

brim and vizor both are nouns.

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

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

Other hyponyms of brim include bill, eyeshade, peak, visor, snap brim.

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

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