A Kanji on its own often has multiple meanings. The real power of Kanji comes from "Jukugo" (compound words). This dictionary doesn't just tell you that 水 means "water." It gives you vocabulary words like 水曜日 (Wednesday) and 水泳 (Swimming).
: Often available at wafuu.com for approximately $25.00 . Kanji Dictionary For Foreigners Learning Japanese 2500 N5