installment debt vs debt

installment debt and debt both are nouns.

Word	Noun	Adjective	Verb	Adverb
installment debt	Yes	No	No	No
debt	Yes	No	No	No

As nouns, debt is a hypernym of installment debt; that is, debt is a word with a broader meaning than installment debt:

installment debt (noun)	debt (noun)
debt to be paid by installments	an obligation to pay or do something
	money or goods or services owed by one person to another
	the state of owing something (especially money)