“early / fast” in Japanese is 早, read sou, sa, haya (そう, さっ, はや). It is a Grade 1 Kyōiku kanji, taught in year 1 of Japanese elementary school, and appears in words such as 早起き (early rising).
What does 早 mean?
朝は早いね。
Same sound, different character — the classic trap. Compare them side by side: