Modifiers matching hydrogen:

• heavy,
• pure,
• elemental,
• mobile,
• atomic,
• active,

Simple categories matching heavy:

• fuel,
• work,
• aggression,
• item,
• metal,
• material,
• object,
• carbide,
• plastic,
• filler,
• book,
• equipment,
• timber,
• smoker,
• car,
• anchor,
• process,
• grinding,
• event,
• vehicle,
• horn,
• fermion,
• abrasive,
• building,
• mineral,
• alkali,
• appliance,
• throw,
• feed,
• petrochemical,
• laundry,
• atom,
• ornament,
• aerosol,
• panel,
• grit,
• user,
• warship,
• chair,
• halogen,
• fibre,
• batter,
• sport,
• laborer,
• ship,
• use,
• staple,
• ingredient,
• subject,
• artillery,
• woollen,
• pot,
• issue,
• elements,
• leather,
• file,
• clothing,
• tree,
• re,
• layer,
• pet,
• athlete,
• jewelry,
• loading,
• container,
• fixture,
• armor,
• breast,
• wood,
• meson,
• prey,
• crime,
• protein,
• debt,
• paraphernalia,
• fragment,
• food,
• clay,
• artifact,
• operator,
• package,
• fluid,
• binder,
• concentrate,
• thing,
• footwear,
• deposit,
• labor,
• pan,
• supply,
• condiment,
• gun,
• syrup,
• ion,
• labour,
• ware,
• eater,
• flour,
• arms,
• weapon,
• composition,
• dog,
• oil,
• tank,
• carriage,
• fiber,
• knit,
• ground,
• chains,
• masonry,
• striker,
• particle,
• ballast,
• job,
• band,
• boot,
• part,
• beer,
• construction,
• truck,
• housekeeping,
• soil,
• constituent,
• sound,
• rig,
• projectile,
• flooring,
• firearm,
• fabric,
• oxide,
• road,
• accumulation,
• opiate,
• garment,
• solid,
• intermediate,
• movement,
• makeup,
• dessert,
• embellishment,
• apparatus,
• assembly,
• drug,
• paper,
• mixture,
• bird,
• dish,
• extra,
• debris,
• lense,
• livestock,
• frame,
• watercraft,
• resistance,
• illness,
• chemical,
• condition,
• luggage,
• beverage,
• housework,
• piece,
• facility,
• weaponry,
• canvas,
• instrument,
• baggage,
• procedure,
• project,
• skillet,
• substrate,
• exercise,
• unit,
• mass,
• device,
• narcotic,
• spoon,
• foliage,
• starches,
• period,
• ammunition,
• particulate,
• article,
• matter,
• liquid,
• industry,
• sulfate,
• atmosphere,
• furniture,
• script,
• ordnance,
• sauce,
• sulfide,
• works,
• structure,
• implement,
• document,
• linen,
• application,
• track,
• hadron,
• coat,
• bike,
• activity,
• spice,
• workout,
• portion,
• flower,
• paint,
• tool,
• repair,
• pelage,
• rock,
• component,
• wrap,
• product,
• hardwood,
• gear,
• toxicity,
• hammer,
• disturbance,
• athletics,
• furnishing,
• offence,
• meat,
• utensil,
• machinery,
• armour,
• music,
• background,
• sphere,
• usage,
• fruit,
• amalgam,
• wall,
• decoration,
• rod,
• jewellery,
• cotton,
• sector,
• powder,
• compound,
• munition,
• filth,
• phase,
• rail,
• vegetation,
• belt,
• carbohydrate,
• fare,
• case,
• vegetable,
• substance,
• stuff,
• glove,
• tax,
• tights,
• denim,
• content,
• vessel,
• contamination,
• loaf,
• synthetic,
• plant,
• molecule,
• gas,
• stone,
• medium,
• load,
• duty,
• isotope,
• thread,
• operations,
• trailer,
• picture,
• commodity,
• transport,
• textile,
• tower,
• grain,
• clothes,
• coating,
• endeavour,
• tape,
• worker,
• surface,
• group,
• sheet,
• web,
• battle,
• body,
• sediment,
• damage,
• aggregate,
• armament,
• machine,
• section,
• bag,
• ornamentation,
• scale,
• merchandise,
• meal,
• earth,
• topic,
• organism,
• seed,
• bedding,
• game,
• solvent,
• hydrocarbon,
• bottom,
• area,
• aircraft,
• fat,
• ore,
• disease,
• literature,
• waste,
• hydrogen,
• cover,
• dough,
• fish,
• cargo,
• solute,
• flavoring,
• cake,
• cloth,
• residue,
• zooplankton,
• mechanism,
• alloy,
• mammal,
• toy,
• ball,
• fraction,
• shoes,
• task,
• contaminant,
• regulation,
• exertion,
• element,
• traffic,
• snake,
• stain,
• system,
• resource,
• mast,
• interior,
• fitting,
• sandwich,
• program,
• outerwear,
• kerosene,
• maintenance,
• fastener,
• hardware,
• salt,
• tranquillizer,
• catalyst,
• cleaning,
• stock,
• acid,
• responsibility,
• expenditure,
• halide,
• data,
• tile,
• animal,
• company,
• weight,
• cable,
• sword,
• theme,