emphasis vs vowel

emphasis

noun
  • The phonetic or phonological feature that distinguishes emphatic consonants from other consonants. 

  • Special attention or prominence given to something. 

  • Special weight or forcefulness given to something considered important. 

  • The use of boldface, italics, or other such formatting to highlight text. 

  • Prominence given to a syllable or words, by raising the voice or printing in italic or underlined type. 

vowel

noun
  • A letter representing the sound of vowel; in English, the vowels are a, e, i, o, u, and y. 

  • A sound produced by the vocal cords with relatively little restriction of the oral cavity, forming the prominent sound of a syllable. 

verb
  • To add vowel points to a consonantal script (e.g. niqqud in Hebrew or harakat in Arabic). 

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