tugboat

Từ điển WordNet v3.1 - WordNet Dictionary

noun

a powerful small boat designed to pull or push larger ships
• Syn:
tug, towboat, tower
• Derivationally related forms:
tow (for: tower), tug (for: tug)
• Hypernyms:
boat
• Part Meronyms:
helm

• Từ đồng nghĩa / Synonyms:
  tug, towboat, tower