aspect vs aspectual

aspect is a noun but aspectual is not a noun.

Word	Noun	Adjective	Verb	Adverb
aspect	Yes	No	No	No
aspectual	No	Yes	No	No

aspect (noun)	aspectual (noun)
the feelings expressed on a person's face
a characteristic to be considered
a distinct feature or element in a problem
the visual percept of a region
the beginning or duration or completion or repetition of the action of a verb

aspect (adjective)	aspectual (adjective)
	of or belonging to an aspect (as an aspect of the verb)