ever so vs ever

ever so and ever both are adverbs.

Word	Noun	Adjective	Verb	Adverb
ever so	No	No	No	Yes
ever	No	No	No	Yes

As adverbs, ever so and ever are synonyms defined as:

ever so (adverb)	ever (adverb)
(intensifier for adjectives) very	at all times; all the time and on every occasion
	at any time
	(intensifier for adjectives) very