pyre vs heap

pyre and heap both are nouns.

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

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

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

pyre (noun)	heap (noun)
wood heaped for burning a dead body as a funeral rite	a car that is old and unreliable
	a collection of objects laid on top of each other
	(often followed by `of') a large number or amount or extent