sterol vs mycosterol

sterol and mycosterol both are nouns.

Word	Noun	Adjective	Verb	Adverb
sterol	Yes	No	No	No
mycosterol	Yes	No	No	No

As nouns, mycosterol is a hyponym of sterol; that is, mycosterol is a word with a more specific, narrower meaning than sterol:

sterol: any of a group of natural steroid alcohols derived from plants or animals; they are waxy insoluble substances
mycosterol: a kind of sterol found in fungi.

Other hyponyms of sterol include cholesterin, cholesterol, ergosterol.

sterol (noun)	mycosterol (noun)
any of a group of natural steroid alcohols derived from plants or animals; they are waxy insoluble substances	a kind of sterol found in fungi.