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