heap
/icons/point.icon meaning - "Stack" vs. "pile" vs. "heap" of paper - English Language & Usage Stack Exchange
If this is a lot to remember at once, you can think roughly of these terms as growing increasingly specific. RoaringFish's comment made me think of this ordering, which is by increasing messiness:
stack ≤ pile ≤ heap
You might also think of these as being proper inclusions if you are familiar with sets:
stack ⊂ pile ⊂ heap
/icons/point.icon 林　剛司（@Haya_Take）さん / Twitter
pile, stack, heapの違いは何となく感覚で使い分けていたがきちんと違いの説明を聞いて納得。｢書類の山｣を英語で何と言うか？角を揃えて整然と積み重ねてあればa stack of papers。雑然と、ならheap。とりあえず積んであればpile。
https://gyazo.com/1c76b92114f9c533745a0f5dabbea09c
source: Rewatch Bakemonogatari - Suruga Monkey Discussion : anime
noun
an untidy collection of things piled up haphazardly:
(雑然と積み上げた物の)山, 堆積, 塊 (!1つ1つをきちんと積み重ねた山はpile)
e.g. she rushed out, leaving her clothes in a heap on the floor.
a mound or pile of a particular substance:
e.g. a heap of gravel.
informal an untidy or dilapidated place or vehicle:
｟おどけて｠ おんぼろ自動車［バイク］
e.g. they climbed back in the heap and headed home.
(a heap of/heaps of) informal a large amount or number of something:
｟くだけた話｠ ; 〖～s/a ～ of A〗 たくさんのA, 多量［数］のA(a lot of A) (!AはC名詞の複数形かU名詞)
e.g. we have heaps of room.
adverb (heaps) British informal
a great deal:
｟くだけて｠ ; 〖～s; 副詞的に比較級を強調して〗 ずっと, かなり(much)
e.g. “How do you like Maggie?” “I like you heaps better!”.
verb with object
1. put (objects or a loose substance) in a pile or mound:
〈人が〉(雑然と)…を積み上げる, 積み重ねる(up, together)
e.g. she heaped logs on the fire
e.g. heaped up in one corner was a pile of junk.
(heap something with) load something copiously with:
〖～ A on ［onto］ B/B with A〗 A〈物〉をB〈物〉に山のように盛る
e.g. he heaped his plate with rice.
(as adjective heaping or chiefly British heaped) (of a spoon or other container) with the contents piled above the brim or edge:
〖名詞の前で〗山盛りの〈スプーン･皿など〉; «…で» いっぱいの, あふれんばかりの «with» .
e.g. a heaped teaspoon of sugar
e.g. a heaping tablespoon of cocoa.
no object form a heap:
積み重なる, 積もる(up, together).
e.g. clouds heaped higher in the west.
2. (heap something on/heap somthing upon) direct a great deal of praise, abuse, criticism, etc. at (someone or something):
〖～ A on upon B/B with A〗 A〈称賛･批判･物など〉をB〈人など〉にたくさん与える
e.g. she heaped praise on the public for its generosity as charity donations continued to pour in
e.g. these are the people who make a living from heaping abuse and ridicule on those of whom they do not approve.
(heap someone/something with) give someone or something (a great deal of praise, abuse, criticism, etc.):
e.g. the film has been heaped with praise by critics and audiences alike.
PHRASES
at the top of the heap (or at the bottom of the heap)
(of a person) at the highest (or lowest) point of a society or organization:
e.g. she had come up the hard way from the very bottom of the heap.
be struck all of a heap
informal be extremely disconcerted.
heap coals of fire on someone's head
British go out of one's way to cause someone remorse. with biblical allusion to Rom. 12:20.
in a heap
(of a person) with the body completely limp:
e.g. he landed in a heap at the bottom of the stairs.
ORIGIN
Old English hēap (noun), hēapian (verb), of Germanic origin; related to Dutch hoop and German Haufen.