Cholesterol and Sterol

Cholesterol noun - An animal sterol that is normally synthesized by the liver; the most abundant steroid in animal tissues.

Sterol and cholesterol are semantically related. In some cases you can use "Sterol" instead a noun "Cholesterol".

Sterol noun - Any of a group of natural steroid alcohols derived from plants or animals; they are waxy insoluble substances.

Cholesterol and sterol are semantically related. Sometimes you can replace term "Cholesterol" with "Sterol", this nouns are similar.