Modifiers matching seam:

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

Simple categories matching straight:

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