Modifiers matching hydrogen:

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

Simple categories matching pure:

• propellent,
• economics,
• metal,
• narcotic,
• material,
• chemical,
• salt,
• worship,
• alcohol,
• whimsy,
• gas,
• compound,
• halide,
• substance,
• glass,
• herb,
• set,
• content,
• oxygen,
• chemistry,
• atmosphere,
• complaint,
• enzyme,
• biology,
• form,
• food,
• drug,
• phenol,
• semiconductor,
• oxide,
• science,
• carbon,
• abstraction,
• fiber,
• manure,
• mathematics,
• emotion,
• powder,
• arts,
• enjoyment,
• spirits,
• fertilizer,
• clay,
• source,
• fluid,
• entertainment,
• water,
• cathode,
• pt,
• placebo,
• discipline,
• hydrocarbon,
• study,
• hydrogen,
• sound,
• odour,
• elements,
• state,
• substrate,
• subject,
• analgesic,
• butter,
• information,
• entity,
• thing,
• alpha-blocker,
• smell,
• halogen,
• starch,
• solvent,
• necessity,
• element,
• computation,
• phase,
• tradition,
• matter,
• silver,
• connection,
• activity,
• liquid,
• fat,
• sugar,
• textile,
• toxemia,
• fuel,
• crystal,
• protein,
• commodity,
• art,
• theory,
• idea,
• concept,
• fibre,
• item,
• object,
• drink,
• plant,
• fabrication,
• waste,
• dish,
• extract,
• molecule,
• opiate,
• solid,
• ingredient,
• mineral,
• oil,
• system,
• fabric,
• carotenoid,
• wool,
• alkane,
• mind,
• nutrient,
• product,
• color,
• carbide,
• antipyretic,
• speech,
• proteinase,
• fruit,
• dielectric,
• notion,
• surface,
• sorbent,
• preparation,
• carbohydrate,
• precipitate,
• component,
• quality,
• motivation,
• cluster,
• feeling,
• shape,
• nitride,
• monosaccharide,
• analysis,
• disorder,
• disaccharide,
• essence,
• conductor,
• translation,
• nut,
• soul,
• bread,
• flavoring,
• polysaccharide,
• meat,
• agonist,
• ore,
• gem,
• contaminant,