A can, also called a tin can or just a tin is a metal container used to store food for very long times. Cans are made from steel coated with a layer of tin.
Some cans have ring pull so you can open them easily, most cans need a can opener to open them.
A case is something that goes around something else, for storage and protection. Expensive things that need to be kept safe are usually kept in cases. The picture is of a violin and its case, but it is common to see guitar cases and glasses cases too.
Case might also be a word for a situation or the state of things, as in "take some money in case you need it".
A cask is a reasonably small container, usually used for storing alcoholic drinks. Casks are usually shaped like a small barrel, although the term is often applied to cheaper boxed wine too.
Cis forChest (box)
A cocoon is a place a caterpillar makes for itself. The caterpillar goes to sleep inside it for some time and then comes out as a butterfly.
A coffin is a box that a dead person is put into. Coffins are either buried in a cemetery, put inside a mausoleum or burnt into ashes in a crematorium.
