kera 啄木鳥

Translation

kera means "Woodpecker" in English.

kera written with kanji is 啄木鳥.
This word contains non-jouyou kanji 常用漢字.

kera written with katakana is ケラ.
kera written with hiragana is けら.

kera is a jukujikun 熟字訓 reading for 啄木鳥 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.