<u>Words that only the vowels I and O:</u>
<u>D</u><u>o</u><u>m</u><u>i</u><u>n</u><u>io</u><u>n</u>
<u>I</u><u>d</u><u>io</u><u>t</u>
<u>L</u><u>o</u><u>g</u><u>i</u><u>c</u>
<u>Here's an explanation as to why these words wouldn't fit the above category:</u>
Courtiers - No, this uses the vowels I and O, but it also uses the vowel e.
Crockery - No, this uses the vowels I and O, but it also uses the vowel e.
Dangerous - No, this uses the vowels I and O, but it also uses the vowels a and e.
Disposal - No, this uses the vowels I and O, but it also uses the vowel a.
Nonsense - No, this uses the vowels I and O, but it also uses the vowel e.
Poisonous - No, this uses the vowels I and O, but it also uses the vowel u.
Premises - No, this uses the vowels I and O, but it also uses the vowel e.
Probable - No, this uses the vowels I and O, but it also uses the vowel a.
Sensible - No, this uses the vowels I and O, but it also uses the vowel e.
Please Note: Bold letters are vowels.
Hope this helps! :)