Idaho, Ohio, Colorado, New Mexico
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Oleo, olio, onto, ordo, orzo and ouzo are 4 letter words that begin with the letter o and end with o.
Some four letter words that start and end with O are:oleoOreoorzo
There are not many 4 letter words that end with an O. However, there is trio, as well as taco.
There are four: New Mexico Colorado Idaho Ohio
Macho and manifesto end with the letter o. Morocco and metro end with the letter o.