stack vs heap

stack and heap both are nouns.

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

As nouns, heap is a hypernym of stack; that is, heap is a word with a broader meaning than stack:

Other hypernyms of stack include agglomerate, cumulation, cumulus, mound, pile.

As nouns, stack and heap are synonyms defined as:

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

As verbs, stack and heap are synonyms defined as:

Other synonyms of stack include pile.

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

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