The word is credo.
cafeteriacandelabracholerachihuahuaclaustrophobiacobracodacopulacommacomacornucopiacupola
havocharmonicholistichectichereticheroichieraticheuristichermetichygienichistorichypnotichomophobichieroglyphicholographichydraulichemophiliachumanistichedonistic
chewchowclawcowcrewcrowcurfew
coz
limbic
credenza
Citycattycrustycrafty
fabricfanaticfantasticfatalisticfetishisticfrolicforensicfranticfeudalisticfuturistic
Five letter words starting with C and ending with X are calyx and codex.
Cream.
Cameo
cadavered