Category Nuances for null:

• soft,
• oral,
• addictive,
• manufactured,
• controlled,
• pharmaceutical,
• narcotic,
• approved,
• analgesic,
• powerful,
• semisynthetic,
• synthetic,
• psychiatric,
• prescribed,
• serious,
• strong,
• depressant,
• psychoactive,
• debilitating,
• common,
• pure,
• individual,
• licit,
• relevant,
• illicit,
• legal,
• basic,
• safe,
• recreational,
• major,
• injectable,
• suppressive,
• restricted,
• lipophilic,
• dangerous,
• pharmacological,
• single,
• soluble,
• alternative,
• heavy,
• psychotropic,
• harmful,
• chemical,
• acting,
• important,
• harder,
• active,
• ii,
• special,
• potent,
• partial,
• illegal,
• additional,
• exogenous,
• central,

Simple Categories for null:

• agent,
• substance,
• drug,
• agonist,
• opiate,
• ligand,
• inhibitor,
• medication,
• narcotic,
• medicine,