indebtedness vs debt

indebtedness and debt both are nouns.

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

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

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

indebtedness (noun)	debt (noun)
a personal relation in which one is indebted for a service or favor	an obligation to pay or do something
an obligation to pay money to another party	money or goods or services owed by one person to another
	the state of owing something (especially money)