παῦσις
paûsis
“a stopping, ceasing”
3 words in English grow from this root.
Heliopause
Earthἥλιοςhḗlios
“where the sun stops”
Magnetopause
Earthμαγνῆτις λίθοςmagnêtis líthos
“where the magnet stops”
Tropopause
Earthτρόποςtrópos
“where the turning stops”