Besides long vowel sounds, short vowel sounds, and the schwa sound, there are some other special sounds in English that are represented by vowels. They are as follows:

• /aw/ sound as in awful and awe
• /oi/ sound as in boil, poison, toilet, and annoy
• /ou/ sound as in lighthouse, cow, flower, and fountain
• /oo/ (ʊ) sound as in took, pulley, platypus, pull, and football

Note that "oo" makes two different sounds in different words, having the ʊ sound as in hook, or the ū sound as in boot.