Linked from
The 8 pages that link to Sterol, each with the reason it gives.
CholesterolNarrower topic: Cholesterol is the principal sterol in animal tissues.
SteroidBroader topic: Cholesterol is a sterol, a major steroid subtype.
SqualeneNarrower topic: Squalene is a precursor to sterols rather than a sterol itself.
WaxesCompared with: Sterols are ring-shaped lipids rather than long-chain fatty-acid esters.