Modifiers matching base:

• secure,
• concrete,
• fixed,
• transparent,
• stable,
• solid,
• heterocyclic,
• traditional,
• nitrogenous,
• supportive,
• suitable,
• flat,
• hydrophilic,
• polar,
• stationary,
• organic,
• operational,
• resistant,
• small,
• rigid,
• standard,
• dry,
• optical,
• aqueous,
• culinary,
• mild,
• strong,
• ceramic,
• inorganic,
• tonic,
• permanent,
• firm,
• supporting,
• thick,
• sturdy,
• vascular,
• portable,
• auxiliary,
• lipophilic,
• level,
• oily,
• inert,
• weak,
• hard,
• exogenous,
• metal,
• square,
• moving,
• social,
• hydrated,
• physical,
• common,
• underlying,
• horizontal,

Simple categories matching rigid:

• organ,
• surface,
• material,
• bottle,
• substance,
• panel,
• device,
• instrument,
• container,
• fixing,
• structure,
• object,
• alteration,
• luggage,
• particle,
• sheet,
• floor,
• item,
• cutoff,
• organs,
• sorbent,
• shape,
• product,
• fabric,
• substrate,
• display,
• adhesive,
• entity,
• matter,
• body,
• article,
• form,
• post,
• wall,
• textile,
• matrix,
• unit,
• paper,
• tool,
• transformation,
• food,
• casing,
• molecule,
• deck,
• protein,
• rod,
• support,
• measure,
• devices,
• element,
• deposit,
• profile,
• metal,
• package,
• plastic,
• sector,
• appliance,
• feature,
• fixture,
• monomer,
• shaft,
• appendage,
• boundary,
• splint,
• tissue,
• aggregate,
• connection,
• coil,
• pipe,
• packing,
• sphere,
• cloth,
• carrier,
• medium,
• plant,
• representation,
• web,
• case,
• obstacle,
• macromolecule,
• connector,
• change,
• airfoil,
• stick,
• ground,
• transparency,
• layer,
• covering,
• hanger,
• fiber,
• fastener,
• foam,
• vehicle,
• gel,
• thread,
• filler,
• fibre,
• cover,
• lining,
• barrier,
• system,
• class,
• thermoplastic,
• portion,
• group,
• strip,
• foundation,
• piece,
• mechanism,
• part,
• tip,
• solid,
• motion,
• component,
• means,
• base,
• frame,
• member,
• plate,
• architecture,
• implement,
• construction,
• bed,
• hitch,
• document,
• instrumentation,
• movement,
• insulation,
• dressing,
• cylinder,
• mineral,
• finish,
• obstruction,
• watercraft,
• cement,
• boot,
• armour,
• block,
• tubing,
• pavement,
• polymer,
• space,
• resin,
• tube,
• rock,