Modifiers matching foam:

• plastic,
• sensitive,
• polymeric,
• resinous,
• edible,
• resilient,
• hydrophilic,
• pliable,
• organic,
• porous,
• dense,
• conventional,
• synthetic,
• rigid,
• cellular,
• thermoplastic,
• lightweight,
• structural,
• solid,
• aqueous,
• pliant,
• inexpensive,
• soft,
• surrounding,
• natural,
• brittle,
• thicker,
• flexible,
• acoustic,
• semirigid,
• metal,
• expanded,
• thermosetting,
• hydrophobic,
• traditional,
• stable,

Simple categories matching acoustic:

• output,
• instrumentation,
• occurrence,
• instrument,
• constant,
• property,
• result,
• transducer,
• domain,
• style,
• sound,
• source,
• signal,
• dimension,
• attribute,
• measure,
• event,
• detector,
• music,
• system,
• interference,
• unit,
• means,
• filter,
• characteristic,
• horn,
• medium,
• space,
• sensation,
• reflector,
• condition,
• keyboard,
• foam,
• resonator,
• material,
• analysis,
• sensor,
• data,
• component,
• quantity,
• bag,
• item,
• context,
• information,
• enclosure,
• alarm,
• environment,
• wonder,
• disturbance,
• group,
• radiator,
• structure,
• artifact,
• function,
• energy,
• noise,
• quality,
• genre,
• indicator,
• form,
• phenomenon,
• track,
• practice,
• converter,
• activity,
• combination,
• equipment,