I. ˈnāv noun
Etymology: Middle English, from Old English nafu; akin to Old English nafela navel
Date: before 12th century
: the hub of a wheel
II. noun
Etymology: Medieval Latin navis, from Latin, ship; akin to Old English nōw end sailor, Greek naus ship, Sanskrit nau
Date: 1673
: the main part of the interior of a church ; especially : the long narrow central hall in a cruciform church that rises higher than the aisles flanking it to form a clerestory