Quick
Sudden
サツ, ソウ
さっ, はやて
早 (ソウ、はや, さ) Early, Fast, Quick
速 (ソク、はや) Fast
迅 (ジン) Swift
颯 (サツ, ソウ、さっ, はやて) Quick, Sudden
疾 (シツ、はや) Rapidly, Rapid
風 (フウ, フ、かぜ) Wind, Style
楓 (フウ、かえで) Maple
The on'yomi さつ and kun'yomi さっ are basically the same. The つ changes to a small っ because it's followed by a と (さっと).