Modifiers matching aircraft:

• operational,
• military,
• maneuverable,
• powerful,
• moving,
• foreign,
• conventional,
• traditional,
• larger,
• heavier,
• sophisticated,
• small,
• unmanned,
• complicated,
• secret,
• annoying,
• large,
• light,
• heavy,
• naval,
• complex,
• slower,
• flexible,
• flying,
• local,
• new,
• commercial,
• model,
• typical,
• aerodynamic,
• exciting,
• advanced,
• exotic,
• controlled,
• available,
• up,
• real,
• deadly,
• transient,
• modern,
• smaller,
• unstable,
• bigger,
• loud,

Simple categories matching unstable:

• component,
• period,
• terrain,
• surface,
• object,
• ground,
• material,
• situation,
• vehicle,
• grain,
• weather,
• matter,
• substance,
• phenomenon,
• support,
• system,
• network,
• basin,
• item,
• structure,
• soil,
• elevation,
• gas,
• control,
• rock,
• operation,
• form,
• place,
• apparatus,
• stone,
• portion,
• slope,
• region,
• medium,
• container,
• aircraft,
• equipment,
• event,
• mineral,
• lubricant,
• molecule,
• particle,
• solid,
• elements,
• formation,
• chemical,
• protein,
• community,
• fabric,
• substrate,
• article,
• location,
• compound,
• star,
• furniture,
• artifact,
• earth,
• assembly,