fourth vs American English

fourth and American English both are nouns.

Word	Noun	Adjective	Verb	Adverb
fourth	Yes	Yes	No	Yes
American English	Yes	No	No	No

fourth (noun)	American English (noun)
the musical interval between one note and another four notes away from it	the English language as used in the United States
one of four equal parts
following the third position; number four in a countable series

fourth (adjective)	American English (adjective)
coming next after the third and just before the fifth in position or time or degree or magnitude

fourth (adverb)	American English (adverb)
in the fourth place