ninetieth vs ordinal

ninetieth and ordinal both are nouns.

Word	Noun	Adjective	Verb	Adverb
ninetieth	Yes	Yes	No	No
ordinal	Yes	Yes	No	No

ninetieth (noun)	ordinal (noun)
position 90 in a countable series of things	the number designating place in an ordered sequence

ninetieth (adjective)	ordinal (adjective)
the ordinal number of ninety in counting order	being or denoting a numerical order in a series
	of or relating to a taxonomic order