御湯[oyu] hot water
塩湯[shioyu] hot salt water (incl. bath)
温湯[ontou] comfortably hot bath
下湯[shimoyu] sitz bath
そと湯[sotoyu] open air bath (in an inn, onsen, etc.)

給湯[kyuutou] hot-water supply
給湯器[kyuutouki] hot-water heater
腰湯[koshiyu] sitting bath
重湯[omoyu] thin rice gruel
出で湯[ideyu] hot spring

助番[sukeban] leader of a female gang
ブロック番号[burokkubangou] block number
暗唱番号[anshoubangou] personal identification number
一貫番号[ikkanbangou] serial number
一番[ichiban] best

一番[hitotsugai] pair
一番鶏[ichibandori] first cockcrowing
一番手[ichibante] first player
一番乗り[ichibannori] leader of a charge
一番線[ichibansen] track no. 1