Vitamin B complex and Water-soluble vitamin

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

Water-soluble vitamin and vitamin B complex are semantically related. In some cases you can use "Water-soluble vitamin" instead a noun phrase "Vitamin B complex".

Water-soluble vitamin noun - Any vitamin that is soluble in water.

Vitamin B complex and water-soluble vitamin are semantically related. Sometimes you can replace phrase "Vitamin B complex" with "Water-soluble vitamin", this phrases are similar.