fiftieth vs ordinal

fiftieth and ordinal both are nouns.

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

fiftieth (noun)	ordinal (noun)
position 50 in a countable series of things	the number designating place in an ordered sequence

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