expending vs spending

expending and spending both are nouns.

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

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

Other hypernyms of expending include disbursal, disbursement, outlay.

expending (noun)	spending (noun)
the act of spending money for goods or services	the act of spending or disbursing money
	money paid out; an amount spent