Modifiers matching estrogen:

• nonsteroidal,
• natural,
• synthetic,
• carcinogenic,
• active,
• endogenous,
• steroidal,
• exogenous,

Simple categories matching carcinogenic:

• aldehyde,
• substance,
• toxin,
• metal,
• hydrocarbon,
• chemical,
• gas,
• solvent,
• agent,
• compound,
• pesticide,
• contaminant,
• mycotoxin,
• preservative,
• process,
• estrogen,
• event,
• pathogen,
• material,
• residue,
• particle,
• condition,
• mixture,
• habit,
• component,
• fiber,