About: coal bed

Premodifier: coal
Head noun: bed

Same concepts
http://dbpedia.org/resource/Coal

Broader concepts

label	provenance	confidence
source	isap:213796043	0.651967
formation	isap:263139383	0.408891

Narrower concepts

label	provenance	confidence
methane	isap:509561082	0.400925
sandstone	isap:486606457	0.278363