In the orthography (used here) of the native Kiowa speaker, Parker McKenzie, who collaborated with both J.P. Harrington and Laurel Watkins, these are represented as below (parenthetic letters are used only at the end of the syllable):
Kiowa has six contrasting vowel qualities with three heights and a front-back distinction. Additionally, there is an oral-nasal contrast on all six vowels. For example, nasality is the only difference between ā́u/ʔɔ́ː/ ('to gamble') and ā́u/ʔɔ̃́ː/ ('to give').