速はやさ

は

や

さ

Meanings

1

Refers to how fast something moves or happens. Often used with 速さ.

じ

速そく

200

キロ

を

超こ

える

。

This car's speed exceeds 200 kilometers per hour.

彼かれの仕し事ごとの速はやさには驚おどろかされる。

I'm amazed at the speed of his work.

2

earliness

Refers to how early something occurs. Typically written as 早さ.

〈物もの〉の速はやさでat the speed of ~
彼かれはすごい速はやさで走はしった。
He ran at an amazing speed.
〈事こと〉の早はやさthe quickness/earliness of ~
彼かれの決けつ断だんの早はやさに驚おどろいた。
I was surprised by how quickly he made his decision.
速はやさを競きそうto compete in speed
選せん手しゅたちは速はやさを競きそった。
The athletes competed in speed.
速はやさを増ますto increase in speed
車くるまは徐じょ々じょに速はやさを増ました。
The car gradually increased its speed.

速そく度どN3sense 1
速度 is the more technical or formal term for speed used in physics, traffic, and machinery, while 速さ is the everyday noun form describing how fast something is.
スピードN3sense 1
スピード is a casual, everyday loanword for speed, while 速さ is the native Japanese noun form used in both spoken and written contexts.
速そく力りょくN2
速さ is a native, more subjective way to say 'speed' (how fast something feels), whereas 速力 suggests an objective, measurable rate.

Noun form of the adjective はやい (fast/early), created by replacing the final い with さ to express degree or -ness.