payment vs spending

payment and spending both are nouns.

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

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

payment (noun)	spending (noun)
the act of paying money	the act of spending or disbursing money
an act of requiting; returning in kind	money paid out; an amount spent
a sum of money paid or a claim discharged