cyanocobalamin vs B complex

cyanocobalamin and B complex both are nouns.

Word	Noun	Adjective	Verb	Adverb
cyanocobalamin	Yes	No	No	No
B complex	Yes	No	No	No

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

cyanocobalamin: a B vitamin that is used to treat pernicious anemia
B complex: originally thought to be a single vitamin but now separated into several B vitamins

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

cyanocobalamin (noun)	B complex (noun)
a B vitamin that is used to treat pernicious anemia	originally thought to be a single vitamin but now separated into several B vitamins