巨いなる[ooinaru] big
巨かい[kyokai] ringleader
巨額[kyogaku] great sum
巨漢[kyokan] giant
巨艦[kyokan] large warship

巨岩[kyogan] huge rock
巨躯[kyoku] big frame
巨口[kyokou] big mouth
巨材[kyozai] big timber
巨財[kyozai] huge fortune

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