We don't have synonyms for circumflexing yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are circumflexion and circumflecting.
(n) :
A diacritical mark (ˆ) placed over a vowel in the orthography or transliteration of many languages to change its pronunciation; while in some other languages over a consonant.
(n) :
A diacritical mark (ˆ) placed over a vowel in the orthography or transliteration of many languages to change its pronunciation; while in some other languages over a consonant.