group O vs type O

group O and type O both are nouns.

Word	Noun	Adjective	Verb	Adverb
group O	Yes	No	No	No
type O	Yes	No	No	No

As nouns, group O and type O are synonyms defined as:

group O and type O: the blood group whose red cells carry neither the A nor B antigens

Other synonyms of group O include O.

group O (noun)	type O (noun)
the blood group whose red cells carry neither the A nor B antigens	the blood group whose red cells carry neither the A nor B antigens