liability vs arrears

liability and arrears both are nouns.

Word	Noun	Adjective	Verb	Adverb
liability	Yes	No	No	No
arrears	Yes	No	No	No

As nouns, arrears is a hyponym of liability; that is, arrears is a word with a more specific, narrower meaning than liability:

Other hyponyms of liability include limited liability, debt, account payable, payable, scot and lot.

liability (noun)	arrears (noun)
the quality of being something that holds you back	an unpaid overdue debt
an obligation to pay money to another party	the state of being behind in payments
the state of being legally obliged and responsible