To extend or stretch out towards something

पहुँचना

English Usage: She reaches for the stars during her dreams.

Hindi Usage: वह अपने सपनों में सितारों की ओर पहुँचती है।

The act of arriving at a place or achieving a goal

पहुँच

English Usage: The reaches of the river are quite beautiful.

Hindi Usage: नदी की पहुँच बहुत सुंदर है।