spending vs defrayment

spending and defrayment both are nouns.

Word	Noun	Adjective	Verb	Adverb
spending	Yes	No	No	No
defrayment	Yes	No	No	No

As nouns, defrayment is a hypernym of spending; that is, defrayment is a word with a broader meaning than spending:

Other hypernyms of spending include defrayal, payment.

spending (noun)	defrayment (noun)
the act of spending or disbursing money	the act of paying money
money paid out; an amount spent