glitter vs brightness

glitter and brightness both are nouns.

Word	Noun	Adjective	Verb	Adverb
glitter	Yes	No	Yes	No
brightness	Yes	No	No	No

As nouns, brightness is a hypernym of glitter; that is, brightness is a word with a broader meaning than glitter:

glitter: the quality of shining with a bright reflected light
brightness: the location of a visual perception along a continuum from black to white

glitter (noun)	brightness (noun)
the quality of shining with a bright reflected light	the location of a visual perception along a continuum from black to white
the occurrence of a small flash or spark	the quality of being luminous; emitting or reflecting light
	intelligence as manifested in being quick and witty

glitter (verb)	brightness (verb)
be shiny, as if wet