pile vs heap

pile and heap both are nouns.

Word	Noun	Adjective	Verb	Adverb
pile	Yes	No	Yes	No
heap	Yes	No	Yes	No

As nouns, pile and heap are synonyms defined as:

Other synonyms of pile include agglomerate, cumulation, cumulus, mound.

As nouns, pile and heap are synonyms defined as:

pile and heap: (often followed by `of') a large number or amount or extent

As verbs, pile and heap are synonyms defined as:

Other synonyms of pile include stack.

pile (noun)	heap (noun)
a nuclear reactor that uses controlled nuclear fission to generate energy	a car that is old and unreliable
battery consisting of voltaic cells arranged in series; the earliest electric battery devised by Volta	a collection of objects laid on top of each other
the yarn (as in a rug or velvet or corduroy) that stands up from the weave	(often followed by `of') a large number or amount or extent
a column of wood or steel or concrete that is driven into the ground to provide support for a structure
fine soft dense hair (as the fine short hair of cattle or deer or the wool of sheep or the undercoat of certain dogs)
a collection of objects laid on top of each other
a large sum of money (especially as pay or profit)
(often followed by `of') a large number or amount or extent

pile (verb)	heap (verb)
arrange in stacks	fill to overflow
place or lay as if in a pile	arrange in stacks
press tightly together or cram	bestow in large quantities