haystack vs haycock

haystack and haycock both are nouns.

Word	Noun	Adjective	Verb	Adverb
haystack	Yes	No	No	No
haycock	Yes	No	No	No

As nouns, haycock is a hyponym of haystack; that is, haycock is a word with a more specific, narrower meaning than haystack:

haystack: a stack of hay
haycock: a small cone-shaped pile of hay that has been left in the field until it is dry enough to carry to the hayrick

haystack (noun)	haycock (noun)
a stack of hay	a small cone-shaped pile of hay that has been left in the field until it is dry enough to carry to the hayrick