1. A pile of hay in the open air for preservation.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• heystack,
• haysack,
• hakmatack,
• hayastann,
• gaystack,
• baystack,
• naystack,
• jaystack,
• uaystack,
• yaystack,
• hzystack,
• hsystack,
• hwystack,
• haysyack,
• haystak,
• haystakc,
• haistack,
• hansbakc,
• TakStock,
• hyerack

• stack,
• joystick,
• Hasidic,
• hostage.

The adjective form of the word "haystack" is "haystacked".

The plural of the "haystack" can be the "haystacks".

The singular of the "haystack" can be the "haystack".