seventieth vs ordinal

seventieth and ordinal both are nouns.

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

seventieth (noun)	ordinal (noun)
position 70 in a countable series of things	the number designating place in an ordered sequence

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