leukopenia vs leucopenia

leukopenia and leucopenia both are nouns.

Word	Noun	Adjective	Verb	Adverb
leukopenia	Yes	No	No	No
leucopenia	Yes	No	No	No

As nouns, leukopenia and leucopenia are synonyms defined as:

leukopenia and leucopenia: an abnormal lowering of the white blood cell count

leukopenia (noun)	leucopenia (noun)
an abnormal lowering of the white blood cell count	an abnormal lowering of the white blood cell count