fifth vs ordinal

fifth and ordinal both are nouns.

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

fifth (noun)	ordinal (noun)
the musical interval between one note and another five notes away from it	the number designating place in an ordered sequence
one part in five equal parts
a quantity of liquor equal to one fifth of a United States gallon
position five in a countable series of things

fifth (adjective)	ordinal (adjective)
coming next after the fourth and just before the sixth in position	being or denoting a numerical order in a series
	of or relating to a taxonomic order