Grade 11.
- catatonic
- catecholamines
- catharsis
- cathartic
- cathedralesque
- catheterisation
- catheterization
- celibacy
- celibate
- cementification
- censure
- censured
- centauromachia
- cephalochordata
- cephalochordate
- cephalothoraces
- cephalothoracic
- cephalothoraxes
- cerebrovascular
- ceremonialists