brown coal

English Thesaurus

1. intermediate between peat and bituminous coal (noun.substance)

hypernym	:	coal,
definition	:	fossil fuel consisting of carbonized vegetable matter deposited in the Carboniferous period (noun.substance)

hypernym	:	humate,
definition	:	material that is high in humic acids (noun.substance)

hyponym	:	jet,
definition	:	a hard black form of lignite that takes a brilliant polish and is used in jewelry or ornamentation (noun.substance)