coal bed

noun 0.749

coal seam

noun 0.702

coal gas

noun 0.692

methane

noun 0.675

biomethane

noun 0.662

methane hydrate

noun 0.650

marsh gas

noun 0.631

coalmining

noun 0.628

coal

noun 0.628

coalface

noun 0.627

coal black

noun 0.624

coalman

noun 0.624

coalfield

noun 0.621

mineral coal

noun 0.620

coal tar

noun 0.612

methanes

noun 0.609

coking coal

noun 0.599

coal plant

noun 0.598

coal train

noun 0.594

coal oil

noun 0.590

coaling

noun 0.590

gas hydrate

noun 0.589

brown coal

noun 0.588

colliery

noun 0.562

coal merchant

noun 0.562

methanogen

noun 0.561

natural gas

noun 0.561

methanogenesis

noun 0.553

coalminer

noun 0.543

methanone

noun 0.540

biogas

noun 0.532

town gas

noun 0.529

methanolic

noun 0.518

firedamp

noun 0.517

coalfish

noun 0.515

charbon

noun 0.514

lignite

noun 0.511

bottled gas

noun 0.510

synthesis gas

noun 0.509

carbon monoxide

noun 0.508

iodomethane

noun 0.507

shale oil

noun 0.503

methanol

noun 0.501

black shale

noun 0.501