Answer: tugboats

AnswerCrossword Clue
TUGBOATS

Port pushers

TUGBOATS

Harbor pushers

TUGBOATS

Harbor helpers

TUGBOATS
Vessels.
TUGBOATS
Salvage vessels.
TUGBOATSPart of the harbor scene.
TUGBOATSCertain craft.
TUGBOATSHarbor craft.
TUGBOATSMaritime tows