hundred-and-fifteenth vs ordinal

hundred-and-fifteenth is not a noun while ordinal is a noun.

Word	Noun	Adjective	Verb	Adverb
hundred-and-fifteenth	No	Yes	No	No
ordinal	Yes	Yes	No	No

hundred-and-fifteenth (noun)	ordinal (noun)
	the number designating place in an ordered sequence

hundred-and-fifteenth (adjective)	ordinal (adjective)
the ordinal number of one hundred fifteen in counting order	being or denoting a numerical order in a series
	of or relating to a taxonomic order