WordNet sense 1 (the quantity a kettle will hold):

kettleful

WordNet sense 2 ((geology) a hollow (typically filled by a lake) that results from the melting of a mass of ice trapped in glacial deposits):

kettle hole

WordNet sense 3 (a large hemispherical brass or copper percussion instrument with a drumhead that can be tuned by adjusting the tension on it):

kettledrum, timpani, tympanum, tympani

WordNet sense 4 (a metal pot for stewing or boiling; usually has a lid):

boiler