The term 'ARK' can be found in the solutions of a crossword puzzle in four and five letter words. The four letter word is 'BOAT', which is a vessel used for transportation on water. The second four letter word is 'NOAH', which is a biblical figure who built an ark to save himself and two of each animal from a great flood. The five letter word is 'CHEST', which is a box or container used for storage. The last five letter word is 'NOAHS', which is the possessive form of Noah's name, referring to the ark he built.