ordinal vs forty-sixth

ordinal is a noun but forty-sixth is not a noun.

Word	Noun	Adjective	Verb	Adverb
ordinal	Yes	Yes	No	No
forty-sixth	No	Yes	No	No

ordinal (noun)	forty-sixth (noun)
the number designating place in an ordered sequence

ordinal (adjective)	forty-sixth (adjective)
being or denoting a numerical order in a series	the ordinal number of forty-six in counting order
of or relating to a taxonomic order