Pap smear vs Papanicolaou smear

Pap smear and Papanicolaou smear both are nouns.

Word	Noun	Adjective	Verb	Adverb
Pap smear	Yes	No	No	No
Papanicolaou smear	Yes	No	No	No

As nouns, Pap smear and Papanicolaou smear are synonyms defined as:

Pap smear and Papanicolaou smear: a sample of secretions and superficial cells of the uterine cervix and uterus; examined with a microscope to detect any abnormal cells

Other synonyms of Pap smear include cervical smear.

Pap smear (noun)	Papanicolaou smear (noun)
a sample of secretions and superficial cells of the uterine cervix and uterus; examined with a microscope to detect any abnormal cells	a sample of secretions and superficial cells of the uterine cervix and uterus; examined with a microscope to detect any abnormal cells