originally vs in the beginning

originally and in the beginning both are adverbs.

Word	Noun	Adjective	Verb	Adverb
originally	No	No	No	Yes
in the beginning	No	No	No	Yes

As adverbs, originally and in the beginning are synonyms defined as:

originally and in the beginning: with reference to the origin or beginning

Other synonyms of originally include primitively.

As adverbs, originally and in the beginning are synonyms defined as:

Other synonyms of originally include earlier, in the first place, to begin with.

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