sazai means "Wren" in English.
|School Level||✕, ✕|
sazai may also be written as 三十三才.
- sazai is a jukujikun 熟字訓 reading for 鷦鷯 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.