everlastingly vs forever

everlastingly and forever both are adverbs.

Word	Noun	Adjective	Verb	Adverb
everlastingly	No	No	No	Yes
forever	No	No	No	Yes

As adverbs, everlastingly and forever are synonyms defined as:

Other synonyms of everlastingly include eternally, evermore.

everlastingly (adverb)	forever (adverb)
for a limitless time	for a limitless time
	for a very long or seemingly endless time
	invariably