aesthetic vs esthetical

aesthetic is a noun but esthetical is not a noun.

Word	Noun	Adjective	Verb	Adverb
aesthetic	Yes	Yes	No	No
esthetical	No	Yes	No	No

As adjectives, aesthetic and esthetical are synonyms defined as:

aesthetic and esthetical: concerning or characterized by an appreciation of beauty or good taste

Other synonyms of aesthetic include aesthetical, esthetic.

aesthetic (noun)	esthetical (noun)
(philosophy) a philosophical theory as to what is beautiful

aesthetic (adjective)	esthetical (adjective)
concerning or characterized by an appreciation of beauty or good taste	concerning or characterized by an appreciation of beauty or good taste
relating to or dealing with the subject of aesthetics
aesthetically pleasing