Genius
noun
If heaven has given you talent, you must be a genius.
てんさい
This is a jukugo word, which usually means on'yomi readings from the kanji. As long as you know the readings for these kanji, you should be able to read this word just fine.
あの女の子は天才だ。
That girl is a genius.
いつか天才テニスプレイヤーとよばれたいです。
I want to be called a genius tennis-player someday.
そのゴリラは、まぎれもなく天才だ。
That gorilla is definitely a genius.