hydrogen

noun 0.661

biohydrogen

noun 0.630

hydrogen burning

noun 0.611

hydrogen electrode

noun 0.609

hydrogen spectrum

noun 0.595

hydrogenolysis

noun 0.582

fuel cell

noun 0.581

metal hydride

noun 0.580

hydrogen bomb

noun 0.578

standard hydrogen electrode

noun 0.577

hydrogenation

noun 0.570

hydrogenosome

noun 0.570

alternative energy

noun 0.567

oxyhydrogen

noun 0.566

green energy

noun 0.562

hydrogen ion

noun 0.560

hybrid vehicle

noun 0.560

hydrogen line

noun 0.556

heavy hydrogen

noun 0.551

hybrid car

noun 0.550

hydroelectricity

noun 0.547

dihydrogen

noun 0.546

hydride

noun 0.545

hydrogen bond

noun 0.544

hydrogen peroxide

noun 0.544

hydroelectric power

noun 0.541

hydropower

noun 0.534

economy

noun 0.525

water gas

noun 0.524

hydrogen halide

noun 0.524

hydrogen bromide

noun 0.524

hydrogen sulfide

noun 0.521

hydrodeoxygenation

noun 0.520

electric vehicle

noun 0.519

hydrogen iodide

noun 0.518

hydrogen fluoride

noun 0.516

hydronium

noun 0.515

hydrocarbon

noun 0.514

market economy

noun 0.512

hydroconversion

noun 0.510

energy crisis

noun 0.509

hydrogeology

noun 0.506

hydrogen carbonate

noun 0.506

parahydrogen

noun 0.504

antihydrogen

noun 0.504

collaborative economy

noun 0.502

bioenergy

noun 0.501