ordinal vs forty-ninth

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

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

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

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