leukemia vs American spelling

leukemia and American spelling both are nouns.

Word	Noun	Adjective	Verb	Adverb
leukemia	Yes	No	No	No
American spelling	Yes	No	No	No

leukemia (noun)	American spelling (noun)
malignant neoplasm of blood-forming tissues; characterized by abnormal proliferation of leukocytes; one of the four major types of cancer	English orthography used in the United States (characterized by 'analyze', 'center', 'usable')