forever vs always

forever and always both are adverbs.

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

As adverbs, forever and always are synonyms defined as:

Other synonyms of forever include constantly, incessantly, perpetually.

forever (adverb)	always (adverb)
for a limitless time	at all times; all the time and on every occasion
for a very long or seemingly endless time	forever; throughout all time
invariably	at any time or in any event
	invariably
	without variation or change, in every case