baboon
monsoon, pontoon, cartoon, eftsoon, Kowloon
Some seven letter words that end with 'oon' are:balloonbassoonbradoonbridoonbuffooncardooncartoondragooneftsoonepizoonfestoongadroongalloongorsoongossoonharpoonjargoonlampoonlardoonmadzoonmatzoonmidnoonmonsoonpatroonplatoonpompoonpontoonprenoonpuccoonpultoonraccoonrattoonrockoontestoontyphoon
maroon
A small group of soldiers ending with "oon" is called a platoon
ful-
Two- Ball Oon.
bra-oon-dee in Scots Gaelic.
beat the elite four then go back to island one and talk to Celio in the Pokemon Center
Cartoon Moon Noon Soon Platoon Spoon
Ki-oon was created in 2003.
I believe it's a soft N, like oon-goo-voo.