Modifiers matching side:

• tasty,
• flat,
• physical,
• straight,
• practical,
• metal,
• longitudinal,
• dark,
• curved,
• convex,
• cognitive,
• small,
• distinct,

Simple categories matching straight:

• line,
• object,
• part,
• conductor,
• material,
• path,
• pin,
• wall,
• surface,
• stick,
• seam,
• stock,
• wood,
• structure,
• vessel,
• form,
• weapon,
• tree,
• bar,
• tube,
• thing,
• limb,
• connector,
• edge,
• fertilizer,
• road,
• blade,
• abrasive,
• activity,
• tool,
• piece,
• plate,
• member,
• side,
• device,