thorax
travaux
Five letter words starting with C and ending with X are calyx and codex.
extricate
STIX !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Could be a four letter word that starts with s and ends with x
sextant
Panamax : the largest cargo ship that will pass through the Panama Canal.
djebel
Twix
Flux, Hoax, Flex
NONE!
Flax.
cortex