very vs really

very is an adjective but really is not an adjective.

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

As adverbs, very and really are synonyms defined as:

Other synonyms of very include rattling, real.

very (adjective)	really (adjective)
precisely as stated
being the exact same one; not any other:

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