pyridoxine vs B-complex vitamin

pyridoxine and B-complex vitamin both are nouns.

Word	Noun	Adjective	Verb	Adverb
pyridoxine	Yes	No	No	No
B-complex vitamin	Yes	No	No	No

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

pyridoxine: a B vitamin that is essential for metabolism of amino acids and starch
B-complex vitamin: originally thought to be a single vitamin but now separated into several B vitamins

Other hypernyms of pyridoxine include B, B complex, B vitamin, vitamin B, vitamin B complex.

pyridoxine (noun)	B-complex vitamin (noun)
a B vitamin that is essential for metabolism of amino acids and starch	originally thought to be a single vitamin but now separated into several B vitamins