group B vs B

group B and B both are nouns.

Word	Noun	Adjective	Verb	Adverb
group B	Yes	No	No	No
B	Yes	No	No	No

As nouns, group B and B are synonyms defined as:

Other synonyms of group B include type B.

group B (noun)	B (noun)
the blood group whose red cells carry the B antigen	aerobic rod-shaped spore-producing bacterium; often occurring in chainlike formations; found primarily in soil
	the blood group whose red cells carry the B antigen
	the 2nd letter of the Roman alphabet
	a logarithmic unit of sound intensity equal to 10 decibels
	a trivalent metalloid element; occurs both in a hard black crystal and in the form of a yellow or brown powder
	originally thought to be a single vitamin but now separated into several B vitamins