Modifiers matching tube:

• medical,
• small,
• thermoplastic,
• fragile,
• elastic,
• metal,
• flat,
• hollow,
• industrial,
• straight,
• respiratory,
• noncombustible,
• airtight,
• round,
• larger,
• metallic,
• large,
• ferrous,
• flexible,
• plastic,
• sterile,
• individual,
• electronic,
• conductive,
• branching,
• useful,
• cylindrical,
• artificial,
• long,
• thin,
• fine,
• rigid,
• inflatable,
• narrow,
• soft,
• important,
• transparent,

Simple categories matching straight:

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