intensifier vs really

intensifier is a noun but really is not a noun.

Word	Noun	Adjective	Verb	Adverb
intensifier	Yes	No	No	No
really	No	No	No	Yes

intensifier (noun)	really (noun)
a modifier that has little meaning except to intensify the meaning it modifies

intensifier (adverb)	really (adverb)
	used to give emphasis
	in fact (used as intensifiers or sentence modifiers)
	in accordance with truth or fact or reality
	in actual fact