9 vs nine

9 and nine both are nouns.

Word	Noun	Adjective	Verb	Adverb
9	Yes	Yes	No	No
nine	Yes	Yes	No	No

As adjectives, 9 and nine are synonyms defined as:

9 and nine: denoting a quantity consisting of one more than eight and one less than ten

Other synonyms of 9 include ix.

As nouns, 9 and nine are synonyms defined as:

Other synonyms of 9 include ennead, IX, Nina from Carolina, niner.

9 (noun)	nine (noun)
the cardinal number that is the sum of eight and one	one of four playing cards in a deck with nine pips on the face
	a team of professional baseball players who play and travel together
	the cardinal number that is the sum of eight and one

9 (adjective)	nine (adjective)
denoting a quantity consisting of one more than eight and one less than ten	denoting a quantity consisting of one more than eight and one less than ten