Here are some other ways to say hello in Japanese, depending on the context:
* おはよう (ohayou): Good morning (used until noon)
* こんばんは (konbanwa): Good evening (used from afternoon onwards)
* 初めまして (hajimemashite): Nice to meet you (used when meeting someone for the first time)
* ただいま (tadaima): I'm home (used when returning home)
* 行ってらっしゃい (itte rasshai): Go and come back safely (used when someone leaves home)
The best way to say hello in Japanese will depend on the time of day and the situation.