obligation vs personal relation

obligation and personal relation both are nouns.

Word	Noun	Adjective	Verb	Adverb
obligation	Yes	No	No	No
personal relation	Yes	No	No	No

As nouns, personal relation is a hypernym of obligation; that is, personal relation is a word with a broader meaning than obligation:

obligation: a personal relation in which one is indebted for a service or favor
personal relation: a relation between persons

Other hypernyms of obligation include personal relationship.

obligation (noun)	personal relation (noun)
the social force that binds you to the courses of action demanded by that force	a relation between persons
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