The difference between Amass and Pile up
When used as verbs, amass means to collect into a mass or heap, whereas pile up means to form a pile, stack, or heap.
Amass is also noun with the meaning: a mass.
check bellow for the other definitions of Amass and Pile up
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Amass as a verb (transitive):
To collect into a mass or heap
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Amass as a verb (transitive):
to gather a great quantity of; to accumulate.
Examples:
"to amass a treasure or a fortune"
"to amass words or phrases"
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Amass as a noun (obsolete):
A mass; a heap.
Examples:
"rfquotek Sir H. Wotton"
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Pile up as a verb (transitive):
To form a pile, stack, or heap.
Examples:
"The kids piled up their boots and coats by the back door."
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Pile up as a verb (idiomatic, intransitive):
To collect or accumulate, as a backlog.
Examples:
"The requests piled up while she was away."