anus vs anal

anus is a noun but anal is not a noun.

Word	Noun	Adjective	Verb	Adverb
anus	Yes	No	No	No
anal	No	Yes	No	No

anus (noun)	anal (noun)
the excretory opening at the end of the alimentary canal

anus (adjective)	anal (adjective)
	a stage in psychosexual development when the child's interest is concentrated on the anal region; fixation at this stage is said to result in orderliness, meanness, stubbornness, compulsiveness, etc.
	of or related to the anus