Examples of compound nouns for the word 'shell' are:
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Some compound nouns are:jigsawthingamajig
Some examples of closed compound nouns are:arrowrootbaseballcardboarddeadbeatelderberryfireplacegoalposthouseboaticebergjumpsuitkeepsakelunchboxmeatloafnotebookoutsideportholequartermasterrooftopsoapsudstenderfootunderdogviewpointwarthogyearbookzooplankton
Examples of compound nouns made up of two nouns are:applesaucebathtubcourtyarddogwoodeggplantfriendshipguest roomhouseboatice creamjackpotkeyboardlunchboxmountain goatnotebookoatmealpower steeringquestion markroot beerspark plugtapewormumpire maskValentine's DaywarthogX-rayyearbookzookeeper
Nouns made up of more than one word are called compound nouns, e.g. Son-in-law Attourney-General Prime Minister