3287378 Well, looking at word origins: Unicorns (magic) could be called 'Magikos' or a 'Magike'. Pegasi (wing) could be called 'Vingers' or a 'Vinge'. Earth Ponies (soil) could be called 'Solums' or a 'Sol'. Alicorns (of two [I took some liberty]) could be called 'Exduos' or a 'Exduo'.
What would Unicorns Be?
What would Pegasi Be?
What would Earth Ponies Be?
What would Alicorns Be?
3287378
Well, looking at word origins:
Unicorns (magic) could be called 'Magikos' or a 'Magike'.
Pegasi (wing) could be called 'Vingers' or a 'Vinge'.
Earth Ponies (soil) could be called 'Solums' or a 'Sol'.
Alicorns (of two [I took some liberty]) could be called 'Exduos' or a 'Exduo'.