The vowels o and oo
share the property of lip-rounding with the consonant w.
Make any of these sounds and you will immediately feel your lips rounding. The
vowel i, however, does not involve lip-rounding
in its production. Sometimes in Anishinaabemowin, the consonant w and the vowel
i fuse together (coalesce) to produce an o, that
is, they produce a single vowel that has properties of each of them-- the vowelness
of i, and the lip-rounding of o.
The same is sometimes true of w and a,
that is, that they combine to form an o.