third-year vs intermediate

third-year is not a noun while intermediate is a noun.

Word	Noun	Adjective	Verb	Adverb
third-year	No	Yes	No	No
intermediate	Yes	Yes	Yes	No

third-year (noun)	intermediate (noun)
	a substance formed during a chemical process before the desired product is obtained

third-year (adjective)	intermediate (adjective)
used of the third or next to final year in United States high school or college	lying between two extremes in time or space or state
	around the middle of a scale of evaluation

third-year (verb)	intermediate (verb)
	act between parties with a view to reconciling differences