quintillionth vs ordinal

quintillionth and ordinal both are nouns.

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

quintillionth (noun)	ordinal (noun)
one part in a quintillion equal parts	the number designating place in an ordered sequence

quintillionth (adjective)	ordinal (adjective)
the ordinal number of one quintillion in counting order	being or denoting a numerical order in a series
	of or relating to a taxonomic order