carbon cycle

noun 0.757

sulfur cycle

noun 0.734

water cycle

noun 0.689

nitrogen

noun 0.688

nitrogen fixation

noun 0.663

nitrogen balance

noun 0.623

denitrification

noun 0.609

dinitrogen

noun 0.599

nitrogenase

noun 0.582

life cycle

noun 0.577

cycle

noun 0.577

nitrogen oxide

noun 0.577

citric acid cycle

noun 0.571

menstrual cycle

noun 0.566

cycling

noun 0.566

nasal cycle

noun 0.556

nitrogen dioxide

noun 0.548

tricarboxylic acid cycle

noun 0.542

nitrogen trichloride

noun 0.537

dinitrogenase

noun 0.535

liquid nitrogen

noun 0.534

nitration

noun 0.530

nitrogen monoxide

noun 0.528

nitric oxide

noun 0.522

glyoxylate cycle

noun 0.518

nitrous oxide

noun 0.516

nitrate

noun 0.515

denitration

noun 0.515

dinitrogen pentoxide

noun 0.515

cyclicity

noun 0.511

photosynthesis

noun 0.510

nitric

noun 0.510

cyclic nucleotide

noun 0.508

dinitrogen tetroxide

noun 0.506

biogeochemistry

noun 0.505

nitrogen narcosis

noun 0.504

nitrogen tetroxide

noun 0.504

recycling

noun 0.504

denitrogenation

noun 0.503