Estrogen and Steroid

Estrogen noun - A general term for female steroid sex hormones that are secreted by the ovary and responsible for typical female sexual characteristics.

Steroid and estrogen are semantically related. In some cases you can use "Steroid" instead a noun "Estrogen".

Steroid noun - Any of several fat-soluble organic compounds having as a basis 17 carbon atoms in four rings; many have important physiological effects.

Estrogen and steroid are semantically related. Sometimes you can replace term "Estrogen" with "Steroid", this nouns are similar.