sixteenth vs ordinal

sixteenth and ordinal both are nouns.

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

sixteenth (noun)	ordinal (noun)
one part in sixteen equal parts	the number designating place in an ordered sequence
position 16 in a countable series of things

sixteenth (adjective)	ordinal (adjective)
coming next after the fifteenth in position	being or denoting a numerical order in a series
	of or relating to a taxonomic order