Is “Haystack” a Scrabble word?
Yes
HAYSTACK
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Haystack
/ˈheɪˌstæk/
noun
1.A mound, pile, or stack of stored hay.
2.(canoeing) A standing wave in a rapid.
3.The text string within which another string is searched for. (see: needle in a haystack)
Synonyms: hayrick, wynd