protoactinium vs Pa

protoactinium and Pa both are nouns.

Word	Noun	Adjective	Verb	Adverb
protoactinium	Yes	No	No	No
Pa	Yes	No	No	No

As nouns, protoactinium and Pa are synonyms defined as:

protoactinium and Pa: a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead

Other synonyms of protoactinium include atomic number 91, protactinium.

protoactinium (noun)	Pa (noun)
a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead	a unit of pressure equal to one newton per square meter
	a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead