Modifiers matching odor:

• familiar,
• strong,
• common,
• bad,
• pungent,
• penetrating,
• special,
• organic,
• distinctive,
• neutral,
• pleasant,
• difficult,
• unpleasant,
• environmental,
• chemical,
• noxious,
• irregular,
• savory,
• animal,
• unwanted,
• foreign,
• irritating,
• strange,
• unusual,
• gaseous,
• herbaceous,
• aromatic,
• everyday,
• fruity,

Simple categories matching gaseous:

• body,
• pollutant,
• hydrocarbon,
• monomer,
• fuel,
• substance,
• constituent,
• fluid,
• alkane,
• contamination,
• compound,
• mixture,
• substrate,
• salt,
• oxide,
• sulphide,
• form,
• material,
• matter,
• component,
• agent,
• atmosphere,
• phenomenon,
• flow,
• anaesthetic,
• fumigant,
• waste,
• anesthetic,
• olefin,
• alkyne,
• contaminant,
• object,
• state,
• chemical,
• mass,
• molecule,
• medium,
• plasma,
• odor,
• carrier,
• cyanide,
• impurity,
• buffer,
• acid,
• reactant,
• precursor,
• system,