compliment
Your presence is a great compliment.
compulsory
English is a compulsory subject in this course; Art is optional.
concise
His letter was concise, omitting everything not pertinent to the job for which he was applying.
condolence
Through his spokesman he expressed his condolences on the victims of the accident.
confidential
You are probably on much more confidential terms with Kitty than I am.
configuration
We know little about the configuration of the star's surface.
conformity
Young people today do not care so much about conformity-they do what they like.