amount vs grand total

amount and grand total both are nouns.

Word	Noun	Adjective	Verb	Adverb
amount	Yes	No	Yes	No
grand total	Yes	No	No	No

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

Other hyponyms of amount include subtotal.

amount (noun)	grand total (noun)
how much there is or how many there are of something that you can quantify	the sum of the sums of several groups of numbers
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

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