ordinal vs fourth

ordinal and fourth both are nouns.

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

ordinal (noun)	fourth (noun)
the number designating place in an ordered sequence	the musical interval between one note and another four notes away from it
	one of four equal parts
	following the third position; number four in a countable series

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

ordinal (adverb)	fourth (adverb)
	in the fourth place