Modifiers matching pin:

• long,
• straight,
• micro,
• thin,
• single,
• harder,
• collectible,
• visible,
• sharp,
• special,
• fitting,
• solid,
• large,

Simple categories matching straight:

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