eight vs cardinal

eight and cardinal both are nouns.

Word	Noun	Adjective	Verb	Adverb
eight	Yes	Yes	No	No
cardinal	Yes	Yes	No	No

eight (noun)	cardinal (noun)
one of four playing cards in a deck with eight pips on the face	crested thick-billed North American finch having bright red plumage in the male
the cardinal number that is the sum of seven and one	a variable color averaging a vivid red
	(Roman Catholic Church) one of a group of more than 100 prominent bishops in the Sacred College who advise the Pope and elect new Popes
	the number of elements in a mathematical set; denotes a quantity but not the order

eight (adjective)	cardinal (adjective)
being one more than seven	being or denoting a numerical quantity but not order
	serving as an essential component