Grade 10.
- commiserate
- commiserations
- commissary
- commissioned
- commonplaceness
- commonsensical
- communicatively
- communicativeness
- communing
- compadre
- companionableness
- comparativeness
- compatibilities
- compiling
- complacency
- complacent
- complexionless
- complimentable
- complimentingly
- comprehendible