水 / 川 makes the さんずい radical (the three little lines) , which is used with a kanji that relates to water.
湖 lake - jezero
海 sea, ocean - more, ocean
泳 swim - plivati
泡 bubble - mjehur
洗 wash - prati, oprati
汁 juice, soup, sap - sok, juha
液 liquid, fluid - tekućina
etc.
