Papanicolaou smear vs Pap smear

Papanicolaou smear and Pap smear both are nouns.

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

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

Papanicolaou smear and Pap 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 Papanicolaou smear include cervical smear.

Papanicolaou smear (noun)	Pap 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