woodpile vs heap

woodpile and heap both are nouns.

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

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

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

woodpile (noun)	heap (noun)
a pile or stack of wood to be used for fuel	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