• Basic forms
• 興る — to arise; to flourish / base form
• 興ります — arises; flourishes / masu form
• 興った — arose; flourished / ta-form
• 興って — arising; flourishing and … / te-form
• 興らない — does not arise / negative
• 興れば — if it arises / conditional
• Common uses
• 関心が興る — interest arises
• 町が興る — a town prospers

興る（おこる） is a godan verb. It describes something **arising naturally** — interest, activity, or prosperity. Less common in daily speech, often used in written or formal contexts.

• Basic forms
• 興す — to start; to raise; to bring about / base form
• 興します — starts; raises / masu form
• 興した — started; raised / ta-form
• 興して — starting; raising and … / te-form
• 興さない — do not start / negative
• 興せば — if (you) start / conditional
• Common uses
• 事業を興す — start a business
• 事件を興す — cause an incident

興す（おこす） is a godan verb. It means **to actively bring something into existence** — a business, movement, or situation. The transitive counterpart of 興る.