• fasa,
• fisha,
• faiza,
• nida,
• fide,
• risa,
• fdisa,
• fijoa,
• fiaa,
• fiba,
• fisi,
• fisz,
• fissa,
• fssa,
• gsa,
• gisar,
• aiea,
• nisa,
• rissa,
• phisa

• Fisk,
• figg,
• Fice,
• Fike,
• fizz,
• fica,
• fick,
• fig,
• FISC,
• figgs,
• fiasco,
• fish,
• fiji,
• fiacco,
• fix.

The adjective form of the word "FISA" is "FISAl" (pronounced fai-zuhl).

The plural form of "FISA" is "FISAs".

The singular form of the word "FISA" is "FISA", as it is already a singular acronym that stands for Foreign Intelligence Surveillance Act.