perpetual vs eternal

perpetual and eternal both are adjectives.

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

As adjectives, perpetual and eternal are synonyms defined as:

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

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