primipara vs para I

primipara and para I both are nouns.

Word	Noun	Adjective	Verb	Adverb
primipara	Yes	No	No	No
para I	Yes	No	No	No

As nouns, primipara and para I are synonyms defined as:

primipara and para I: (obstetrics) woman who has been delivered of a child for the first time

primipara (noun)	para I (noun)
(obstetrics) woman who has been delivered of a child for the first time	(obstetrics) woman who has been delivered of a child for the first time