institution vs institutional

institution is a noun but institutional is not a noun.

Word	Noun	Adjective	Verb	Adverb
institution	Yes	No	No	No
institutional	No	Yes	No	No

institution (noun)	institutional (noun)
the act of starting something for the first time; introducing something new
an establishment consisting of a building or complex of buildings where an organization for the promotion of some cause is situated
a hospital for mentally incompetent or unbalanced person
a custom that for a long time has been an important feature of some group or society
an organization founded and united for a specific purpose

institution (adjective)	institutional (adjective)
	organized as or forming an institution
	relating to or constituting or involving an institution
	characteristic or suggestive of an institution especially in being uniform or dull or unimaginative