increase vs runup

increase and runup both are nouns.

Word	Noun	Adjective	Verb	Adverb
increase	Yes	No	Yes	No
runup	Yes	No	No	No

As nouns, runup is a hyponym of increase; that is, runup is a word with a more specific, narrower meaning than increase:

Other hyponyms of increase include augmentation, concentration, explosion, jump, leap, run-up, waxing.

increase (noun)	runup (noun)
the act of increasing something	a substantial increase over a relatively short period of time
the amount by which something increases
a change resulting in an increase
a process of becoming larger or longer or more numerous or more important
a quantity that is added

increase (verb)	runup (verb)
become bigger or greater in amount
make bigger or more