outnumber vs amount

outnumber is not a noun while amount is a noun.

Word	Noun	Adjective	Verb	Adverb
outnumber	No	No	Yes	No
amount	Yes	No	Yes	No

As verbs, amount is a hypernym of outnumber; that is, amount is a word with a broader meaning than outnumber:

Other hypernyms of outnumber include add up, come, number, total.

outnumber (noun)	amount (noun)
	how much there is or how many there are of something that you can quantify
	the relative magnitude of something with reference to a criterion
	a quantity obtained by the addition of a group of numbers
	a quantity of money

outnumber (verb)	amount (verb)
be larger in number	to measure up to in kind or quality
	add up in number or quantity
	be tantamount or equivalent to