The letters CO are the abbreviation for company (co.) or county, or capitalized, the state of Colorado, or Colchester, or the nation of Colombia. It is also the chemical formula for carbon monoxide.
It can also be an acronym with meanings including:
Commanding Officer
Corrections Officer
Change Order
Covert Operations
Co
That is the correct spelling of "co-owner" (one of the owners).
Colleague: a co-worker
Co.
salon co
You spell a partner, teammate or co-worker who is engaged in a task or contest with you and who needs a break.
ex coworker
That is a proper spelling of "co-chairman" (one of two or more joint chairmen).
The spelling may be one word "cofounder" or hyphenated "co-founder" (which is sometimes clearer).
Aguardiente or co
It seems as if the questioner has answered the question in posing it?
That is one correct spelling for project co-ordinator. It can also be spelt as project coordinator.