| Subject | English | Thesaurus |
| tradem., abbr. | Bay Area Laboratory Co Op | BALCO |
| agric. | co-op | cooperation |
| abbr. | co-op | co-operation (Vosoni) |
| abbr. | co-op | co-operative (Vosoni) |
| abbr., ed. | CO-OP | Cooperative Education |
| abbr., ed. | CO-OP | Cooperative |
| abbr. | co-op | cooperative society |
| abbr., econ. | co-op | cooperative store |
| abbr. | "co-op" | co-operative |
| inf. | co-op | cooperative |
| abbr., adv. | co-op advertising | cooperative advertising |
| airports, abbr. | Co-Op Point, Manitoba, Canada | YCP |
| abbr., adv. | co-op program | cooperative program |
| O&G | co.op.s.s. | company-operated service station |
| abbr., adv. | co-op store | cooperative store |
| abbr., adv. | co-op wholesaler | cooperative wholesaler |
| abbr., mil. | comd op co | command operations company |
| tech. | DF op | direction finder operator |
| ed., abbr. | Downs Industry Schools Co Op | DISCO |
| NGO, abbr. | Ontario Flower Growers Co-op | OFG |
| Nasdaq, abbr. | OP-Tech Environmental Services | OTES |
