amount vs quantity

amount and quantity both are nouns.

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

As nouns, amount and quantity are synonyms defined as:

amount and quantity: how much there is or how many there are of something that you can quantify

Other synonyms of amount include measure.

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

As nouns, quantity is a hypernym of amount; that is, quantity is a word with a broader meaning than amount:

amount: a quantity obtained by the addition of a group of numbers
quantity: the concept that something has a magnitude and can be represented in mathematical expressions by a constant or a variable

amount (noun)	quantity (noun)
how much there is or how many there are of something that you can quantify	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	an adequate or large amount
a quantity obtained by the addition of a group of numbers	the concept that something has a magnitude and can be represented in mathematical expressions by a constant or a variable
a quantity of money

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