Category Nuances for null:

• synthetic,
• addictive,
• narcotic,
• individual,
• pharmaceutical,
• controlled,
• important,
• licit,
• powerful,
• analgesic,
• poisonous,
• soluble,
• expensive,
• polar,
• systemic,
• old,
• psychoactive,
• illegal,
• natural,
• major,
• external,
• particular,
• alternative,
• potent,
• lipophilic,
• epidural,
• central,
• traditional,
• serious,
• partial,
• strong,
• inhibitory,
• bitter,
• restricted,
• hard,
• anesthetic,
• iv,
• modern,
• miscellaneous,
• alkaline,
• deadly,
• conventional,
• historical,
• legal,
• illicit,
• medicinal,
• recreational,
• ordinary,
• effective,
• nervous,
• psychotropic,
• lethal,
• common,
• pharmacologic,
• needed,
• suppressive,
• new,
• cationic,
• secondary,
• oral,
• hardcore,
• harmful,
• toxic,
• depressant,
• pharmacological,
• rewarding,
• useful,
• exogenous,
• hydrophilic,
• local,
• cardiac,
• relevant,
• prescribed,
• dangerous,
• simple,
• ii,
• pure,
• heavy,
• damaging,
• medical,
• manufactured,
• organic,
• western,
• active,
• injectable,
• essential,
• chemical,
• basic,
• related,

Simple Categories for null:

• substance,
• poison,
• medicine,
• drug,
• anesthetic,
• ligand,
• metabolite,
• painkiller,
• narcotic,
• opium,
• analgesic,
• opiate,
• pharmaceutical,
• agent,
• antipyretic,
• depressant,
• agonist,
• system,
• thing,
• anaesthetic,
• remedy,
• nature,
• medication,
• entity,