O-Os is a 4 letter English word.
You can make 9 anagrams from letters in o-os (-oos).
First recorded in 1885-90, o-o is from the Hawaiian word ʿōʿō
When the mamo became rare the natives began to substitute the light yellow feathers growing under the wings of the o-o.
Either he can o-o now; if not, then it is proof positive that his defence is bad.