originally vs to begin with

originally and to begin with both are adverbs.

Word	Noun	Adjective	Verb	Adverb
originally	No	No	No	Yes
to begin with	No	No	No	Yes

As adverbs, originally and to begin with are synonyms defined as:

Other synonyms of originally include earlier, in the beginning, in the first place.

originally (adverb)	to begin with (adverb)
in an manner suggesting originality	before now
with reference to the origin or beginning
before now