vacancy rate vs pct

vacancy rate and pct both are nouns.

Word	Noun	Adjective	Verb	Adverb
vacancy rate	Yes	No	No	No
pct	Yes	No	No	No

As nouns, pct is a hypernym of vacancy rate; that is, pct is a word with a broader meaning than vacancy rate:

vacancy rate: the percentage of all rental units (as in hotels) that are unoccupied or not rented at a given time
pct: a proportion in relation to a whole (which is usually the amount per hundred); ten percent

Other hypernyms of vacancy rate include per centum, percent, percentage.

vacancy rate (noun)	pct (noun)
the percentage of all rental units (as in hotels) that are unoccupied or not rented at a given time	a proportion in relation to a whole (which is usually the amount per hundred); ten percent