Some words that start and end with the letter K are:
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There are plenty of words that end with "tion", but none that start with K unfortunately!
kin
keratinisation
Some compound words that start with K are:keepsakekettledrumkeyboardkeychainkickoffkindheartedknickknackknockoff
Some five letter words that end with K are:blackblinkblockbrickbrinkbrookchickchuckchunkclerkclickclockcluckclunkcrackcrankcreekcrookdrankdrinkdrunkflankflaskfleckflickfrankfreakfriskfrockknockKodakprickquickquirkshirkshookslinkskunksparkstarksteakstickstinkstorkstucktricktruckwhisk