pct vs occupancy rate

pct and occupancy rate both are nouns.

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

As nouns, occupancy rate is a hyponym of pct; that is, occupancy rate is a word with a more specific, narrower meaning than pct:

pct: a proportion in relation to a whole (which is usually the amount per hundred); ten percent
occupancy rate: the percentage of all rental units (as in hotels) are occupied or rented at a given time

Other hyponyms of pct include absentee rate, vacancy rate, unemployment rate.

pct (noun)	occupancy rate (noun)
a proportion in relation to a whole (which is usually the amount per hundred); ten percent	the percentage of all rental units (as in hotels) are occupied or rented at a given time