funeral pyre vs heap

funeral pyre and heap both are nouns.

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

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

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

funeral 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