What is the suffix for level 5 and above of elemental spells in Final Fantasy?

What is the suffix for level 5 and above of elemental spells in Final Fantasy? - Toy figure of elephant placed on log on stony ground in nature

Example Fire, Fira, Firaga, Firaja, ??? Has any source ever mention higher tier than -ja spells?

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FINAL FANTASY XV All limit break magic - Electron, Flare and Freeze

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