Vitamin G and Vitamin B

Vitamin G noun - A B vitamin that prevents skin lesions and weight loss.

Vitamin B and vitamin G are semantically related. In some cases you can use "Vitamin B" instead a noun phrase "Vitamin G".

Vitamin B noun - Originally thought to be a single vitamin but now separated into several B vitamins.

Vitamin G and vitamin B are semantically related. Sometimes you can replace phrase "Vitamin G" with "Vitamin B", this phrases are similar.