Modifiers matching seam:

• visible,
• thin,
• straight,
• open,

Simple categories matching straight:

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