Modifiers matching foam:

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

Simple categories matching acoustic:

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