amnio vs amniocentesis

amnio and amniocentesis both are nouns.

Word	Noun	Adjective	Verb	Adverb
amnio	Yes	No	No	No
amniocentesis	Yes	No	No	No

As nouns, amnio and amniocentesis are synonyms defined as:

amnio and amniocentesis: (pregnancy) extraction by centesis of amniotic fluid from a pregnant woman (after the 15th week of pregnancy) to aid in the diagnosis of fetal abnormalities

amnio (noun)	amniocentesis (noun)
(pregnancy) extraction by centesis of amniotic fluid from a pregnant woman (after the 15th week of pregnancy) to aid in the diagnosis of fetal abnormalities	(pregnancy) extraction by centesis of amniotic fluid from a pregnant woman (after the 15th week of pregnancy) to aid in the diagnosis of fetal abnormalities