1. Scotch.

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

• scoce,
• secods,
• scvs,
• schoes,
• scors,
• socets,
• acouts,
• scotish,
• scote,
• scerts,
• scooty,
• sccott,
• scotal,
• scoita,
• scotus,
• screts,
• scoth,
• ascts,
• sockots,
• scortt

• scotch,
• schtikl,
• scottish,
• scates,
• scotsman,
• schtick,
• scads,
• schtik.

The adjective form of the word "Scots" is "Scottish".