point in time vs quantity

point in time and quantity both are nouns.

Word	Noun	Adjective	Verb	Adverb
point in time	Yes	No	No	No
quantity	Yes	No	No	No

As nouns, quantity is a hypernym of point in time; that is, quantity is a word with a broader meaning than point in time:

point in time: an instant of time
quantity: how much there is or how many there are of something that you can quantify

Other hypernyms of point in time include amount, measure.

point in time (noun)	quantity (noun)
an instant of time	how much there is or how many there are of something that you can quantify
	an adequate or large amount
	the concept that something has a magnitude and can be represented in mathematical expressions by a constant or a variable