Motor boat
From BAWiki
Definition
Ship without cargo space or cargo area, but occasionally with a working deck, with a displacement of < 15 m3 and a permanently installed engine power > 22 kW, that due to its design can't be assigned to any overriding purpose. Eg. Supervisory boat of an outer district. Motorboats can also be part of another vessel or a facility eg. of a lifeboat.
Synonyms
power boat