amount vs decrement

amount and decrement both are nouns.

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

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

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

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