ordinal vs thirty-ninth

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

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

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

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