iruka means "Dolphin" in English.
|School Level||小２, 中|
- iruka is a jukujikun 熟字訓 reading for 海豚 in this word. That is: those kanji are only read that way when they come together like that.
Beware: some kanji that are difficult to handwrite are easy to type on the computer, which may skew the usage statistics.