Modifiers matching pipe:

• plastic,
• hard,
• smaller,
• thicker,
• underground,
• concrete,
• ceramic,
• resilient,
• industrial,
• additional,
• rigid,
• metal,
• metallic,
• unusual,
• flexible,
• larger,
• cylindrical,
• temporary,
• vertical,
• conventional,
• hollow,
• fixed,
• decorative,
• main,
• standard,
• old,
• ferromagnetic,
• sized,
• nonmetallic,
• exposed,
• inside,

Simple categories matching thicker:

• fabric,
• liquid,
• material,
• pipe,
• muscle,
• wrap,
• article,
• bedclothes,
• substance,
• card,
• medium,
• fluid,
• papers,
• jacket,
• fibre,
• cord,
• mixture,
• clothing,
• paint,
• document,
• foam,
• original,
• product,
• sheet,
• feed,
• piece,
• batter,
• coating,
• lubricant,
• oil,
• part,
• leather,
• cloth,
• paper,