inositol vs vitamin B complex

inositol and vitamin B complex both are nouns.

Word	Noun	Adjective	Verb	Adverb
inositol	Yes	No	No	No
vitamin B complex	Yes	No	No	No

As nouns, vitamin B complex is a hypernym of inositol; that is, vitamin B complex is a word with a broader meaning than inositol:

inositol: an optically inactive alcohol that is a component of the vitamin B complex
vitamin B complex: originally thought to be a single vitamin but now separated into several B vitamins

Other hypernyms of inositol include B-complex vitamin, B, B complex, B vitamin, vitamin B.

inositol (noun)	vitamin B complex (noun)
an optically inactive alcohol that is a component of the vitamin B complex	originally thought to be a single vitamin but now separated into several B vitamins