ordinal vs seventieth

ordinal and seventieth both are nouns.

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

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

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