never-ending vs perpetual

never-ending and perpetual both are adjectives.

Word	Noun	Adjective	Verb	Adverb
never-ending	No	Yes	No	No
perpetual	No	Yes	No	No

As adjectives, never-ending and perpetual are synonyms defined as:

never-ending and perpetual: uninterrupted in time and indefinitely long continuing

Other synonyms of never-ending include ceaseless, constant, incessant, unceasing, unremitting.

never-ending (adjective)	perpetual (adjective)
uninterrupted in time and indefinitely long continuing	uninterrupted in time and indefinitely long continuing
	continuing forever or indefinitely