Modifiers matching aldehyde:

• volatile,
• reactive,
• unsaturated,
• ordinary,
• hydrophilic,
• heterocyclic,
• airborne,
• bulky,
• light,
• carcinogenic,
• aliphatic,
• molecular,
• active,
• simple,
• toxic,
• aromatic,
• strong,
• uncharged,

Simple categories matching heterocyclic:

• compound,
• base,
• group,
• acid,
• system,
• polymer,
• aldehyde,
• amine,
• phosphate,
• chemical,
• constituent,
• substrate,
• atom,