obligation vs oblige

obligation is a noun but oblige is not a noun.

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

obligation (noun)	oblige (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

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