eternal vs perpetual

eternal and perpetual both are adjectives.

Word	Noun	Adjective	Verb	Adverb
eternal	No	Yes	No	No
perpetual	No	Yes	No	No

As adjectives, eternal and perpetual are synonyms defined as:

Other synonyms of eternal include aeonian, ageless, eonian, everlasting, unceasing, unending.

eternal (adjective)	perpetual (adjective)
tiresomely long; seemingly without end	uninterrupted in time and indefinitely long continuing
continuing forever or indefinitely	continuing forever or indefinitely