The difference between Heap and Pile up
When used as verbs, heap means to pile in a heap, whereas pile up means to form a pile, stack, or heap.
Heap is also noun with the meaning: a crowd.
Heap is also adverb with the meaning: very.
check bellow for the other definitions of Heap and Pile up
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Heap as a noun:
A crowd; a throng; a multitude or great number of people.
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Heap as a noun:
A pile or mass; a collection of things laid in a body, or thrown together so as to form an elevation.
Examples:
"a heap of earth or stones"
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Heap as a noun:
A great number or large quantity of things.
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Heap as a noun (computing):
A data structure consisting of trees in which each node is greater than all its children.
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Heap as a noun (computing):
Memory that is dynamically allocated.
Examples:
"You should move these structures from the stack to the heap to avoid a potential stack overflow."
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Heap as a noun (colloquial):
A dilapidated place or vehicle.
Examples:
"My first car was an old heap."
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Heap as a noun (colloquial):
A lot, a large amount
Examples:
"Thanks a heap!"
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Heap as a verb (transitive):
To pile in a heap.
Examples:
"He heaped the laundry upon the bed and began folding."
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Heap as a verb (transitive):
To form or round into a heap, as in measuring.
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Heap as a verb (transitive):
To supply in great quantity.
Examples:
"They heaped praise upon their newest hero."
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Heap as an adverb (representing broken English stereotypically or comically attributed to Native Americans; may be offensive):
Very.
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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."