circumflex vs curviform

circumflex

adj
  • Curving around. 

  • Having a circumflex mark. 

noun
  • 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. 

verb
  • To mark or pronounce with a circumflex. 

curviform

adj
  • Having a curved shape. 

How often have the words circumflex and curviform occurred in a corpus of books? (source: Google Ngram Viewer )