heap vs stack

heap and stack both are nouns.

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

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

As nouns, heap and stack are synonyms defined as:

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

As verbs, heap and stack are synonyms defined as:

Other synonyms of heap include pile.

heap (noun)	stack (noun)
a car that is old and unreliable	a large tall chimney through which combustion gases and smoke can be evacuated
a collection of objects laid on top of each other	a storage device that handles data so that the next item to be retrieved is the item most recently stored (LIFO)
(often followed by `of') a large number or amount or extent	a list in which the next item to be removed is the item most recently stored (LIFO)
	an orderly pile
	(often followed by `of') a large number or amount or extent

heap (verb)	stack (verb)
fill to overflow	arrange in stacks
arrange in stacks	load or cover with stacks
bestow in large quantities	arrange the order of so as to increase one's winning chances