開発
かいはつ · kaihatsu · JLPT N1 · noun
development
🛠️ 開 = open + 発 = launch: open something up and launch it to develop it
Kaihatsu combines 開 (open, open up) and 発 (launch, emit, as in 出発 departure). Opening something up and sending it out into use is how development works.