There are 18 10-letter words that start with 'cos'.
| coscripted | coseismals | coseismics |
| cosinesses | cosmically | cosmogenic |
| cosmogonic | cosmolined | cosmolines |
| cosmonauts | cosmopolis | cosmotrons |
| cosponsors | costarring | costlessly |
| costliness | costmaries | costumiers |
Note: These 18 10-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)