Category Nuances for firewall:

• normal,
• additional,
• protective,
• primary,
• electronic,
• secure,
• diverse,
• separate,
• technical,
• active,
• expensive,
• intermediate,
• independent,
• static,
• defined,
• internal,
• preventive,
• new,
• serial,
• complex,
• typical,
• multipurpose,
• outer,
• defensive,
• underlying,
• related,
• physical,
• adequate,
• rigid,
• precautionary,
• external,
• broadband,
• traditional,
• passive,
• single,
• radio,
• remote,
• reasonable,
• necessary,
• extra,
• specialized,
• ancillary,
• real,
• supporting,
• current,
• out,
• conventional,
• several,
• critical,
• unique,
• wan,
• usual,
• required,
• entire,
• surrounding,
• particular,
• common,
• important,
• standard,
• individual,
• key,
• technological,
• trusted,
• nearby,
• digital,
• redundant,
• central,
• familiar,
• solid,
• useful,

Simple Categories for firewall:

• system,
• unit,
• thing,
• part,
• measure,
• defence,
• connection,
• implementation,
• hardware,
• action,
• device,
• structure,
• item,
• group,
• equipment,
• entity,
• installation,
• object,
• activity,
• extra,
• area,
• means,
• layer,