There are 19 7-letter words that start with 'cos'.
| coshers | coshing | cosiest | cosigns |
| cosines | cosmids | cosmism | cosmist |
| cossack | cossets | costard | costars |
| costate | costers | costing | costive |
| costrel | costume | cosying | |
Note: These 19 7-letter words that start with 'cos' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with cosm, cost, cosi, cose, cosh, coss, cosp, cosc, cosu, cosy.
4-letter words start with 'cos' (4)