Contradictory

　　Controversial

　　Convection

　　Convection pipe

　　Conventional

　　Conversion

　　Conversion from Buddhism to Christianity

　　Convert into

　　Convert water into steem

　　Conveyor belt

　　Conviction

　　Conviction

　　I have strong conviction.

　　Convoluted

　　Evolution

　　Revolution

　　They have convoluted relations.

　　Coral reef

　　Corporate

　　Corporate right

　　Corporate board

　　Board of directors

　　Corporation

　　Correlate

　　Correlation