oblige vs obligation

oblige is not a noun while obligation is a noun.

Word	Noun	Adjective	Verb	Adverb
oblige	No	No	Yes	No
obligation	Yes	No	No	No

oblige (noun)	obligation (noun)
	the social force that binds you to the courses of action demanded by that force
	a legal agreement specifying a payment or action and the penalty for failure to comply
	a written promise to repay a debt
	a personal relation in which one is indebted for a service or favor
	the state of being obligated to do or pay something

oblige (verb)	obligation (verb)
bind by an obligation; cause to be indebted
provide a service or favor for someone
force somebody to do something