Modifiers matching estrogen:

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

Simple categories matching steroidal:

• drug,
• estrogen,
• medication,
• compound,
• hormone,
• material,
• cream,
• substance,
• substrate,
• androgen,
• agent,
• progestin,
• receptor,