wood coal

Từ điển WordNet v3.1 - WordNet Dictionary

noun

1. intermediate between peat and bituminous coal
• Syn:
lignite, brown coal
• Hypernyms:
coal, humate
• Hyponyms:
jet
2. a carbonaceous material obtained by heating wood or other organic matter in the absence of air
• Syn:
charcoal
• Hypernyms:
fuel, carbon, C, atomic number 6