We don't have synonyms for flate yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are fate, flute and plate.
°(music) A note played a semitone lower than a natural, denoted by the symbol ? sign placed after the letter representing the note (e.g., B?) or in front of the note symbol (e.g. ??).
°(music) A note played a semitone lower than a natural, denoted by the symbol ? sign placed after the letter representing the note (e.g., B?) or in front of the note symbol (e.g. ??).