per centum vs pct

per centum and pct both are nouns.

Word	Noun	Adjective	Verb	Adverb
per centum	Yes	No	No	No
pct	Yes	No	No	No

As nouns, per centum and pct are synonyms defined as:

per centum and pct: a proportion in relation to a whole (which is usually the amount per hundred); ten percent

Other synonyms of per centum include percent, percentage.

per centum (noun)	pct (noun)
a proportion in relation to a whole (which is usually the amount per hundred); ten percent	a proportion in relation to a whole (which is usually the amount per hundred); ten percent