Modifiers matching alkane:

• pure,
• light,
• volatile,
• saturated,
• small,
• lighter,
• simple,
• typical,
• tertiary,
• secondary,
• soluble,
• gaseous,
• compressed,
• heavier,
• liquid,

Simple categories matching gaseous:

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