vitamin K vs vitamin K1

vitamin K and vitamin K1 both are nouns.

Word	Noun	Adjective	Verb	Adverb
vitamin K	Yes	No	No	No
vitamin K1	Yes	No	No	No

As nouns, vitamin K1 is a hyponym of vitamin K; that is, vitamin K1 is a word with a more specific, narrower meaning than vitamin K:

vitamin K: a fat-soluble vitamin that helps in the clotting of blood
vitamin K1: a form of vitamin K, based on 2-methyl-1,4-naphthoquinone, with a 3-phytyl substituent

Other hyponyms of vitamin K include phylloquinone, phytonadione, menadione, vitamin K3.

vitamin K (noun)	vitamin K1 (noun)
a fat-soluble vitamin that helps in the clotting of blood	a form of vitamin K, based on 2-methyl-1,4-naphthoquinone, with a 3-phytyl substituent