different between haywain vs haystack

English

haywain (plural haywains)

From Middle English haystak, haystake, hey stak, equivalent to hay +? stack.

haystack (plural haystacks)

A mound, pile, or stack of stored hay.
(canoeing) A standing wave in a rapid.
(programming) The text string within which another string is searched for. (see: needle in a haystack)
A dish composed of a starchy food (rice, tortillas, crackers, etc.) topped by a protein (beans, cheese, meat, etc.) in combination with fresh vegetables, assembled on the plate by the diner.

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