The Caqueta (Columbia) and Columbia (Canada - British Columbia: US - Washington & Oregon) are rivers. They begin with C and end with A.
· Congo
Five letter words starting with C and ending with X are calyx and codex.
ceasechafechasechidechimechivechokechorechosechuteclonecloseclovecratecravecrimecrudecursecurvecycle
credenza
crows, carts
calthrop
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turmeric
cadavered
Cream.
Cameo
Narc.