円蓋[engai] cupola
掩蓋[engai] cover(ing)
火蓋[hibuta] apron of a gun
蓋し[kedashi] perhaps
蓋然性[gaizensei] probability

口蓋[kougai] palate
臭い物に蓋[kusaimononifuta] looking the other way
上げ蓋[agebuta] trap door
天蓋[tengai] canopy

データの先頭[deetanosentou] beginning of data
一頭[ittou] one large animal (horses, cattle, etc.)
一頭立て[ittoudate] one-horse (carriage)
咽頭[intou] pharynx
駅頭[ekitou] station

音頭[ondo] leading a group of people
会頭[kaitou] society president
街頭[gaitou] in the street
核弾頭[kakudantou] nuclear warhead
巻頭[kantou] opening page of book