WBC vs white blood cell

WBC and white blood cell both are nouns.

Word	Noun	Adjective	Verb	Adverb
WBC	Yes	No	No	No
white blood cell	Yes	No	No	No

As nouns, WBC and white blood cell are synonyms defined as:

WBC and white blood cell: blood cells that engulf and digest bacteria and fungi; an important part of the body's defense system

Other synonyms of WBC include leucocyte, leukocyte, white blood corpuscle, white cell, white corpuscle.

WBC (noun)	white blood cell (noun)
blood cells that engulf and digest bacteria and fungi; an important part of the body's defense system	blood cells that engulf and digest bacteria and fungi; an important part of the body's defense system