terrifically vs marvellously

terrifically and marvellously both are adverbs.

Word	Noun	Adjective	Verb	Adverb
terrifically	No	No	No	Yes
marvellously	No	No	No	Yes

As adverbs, terrifically and marvellously are synonyms defined as:

Other synonyms of terrifically include marvelously, superbly, toppingly, wonderfully, wondrous, wondrously.

terrifically (adverb)	marvellously (adverb)
(used as an intensifier) excellently	(used as an intensifier) excellently