run up vs overcast

run up is not a noun while overcast is a noun.

Word	Noun	Adjective	Verb	Adverb
run up	No	No	Yes	No
overcast	Yes	Yes	Yes	No

As verbs, overcast is a hyponym of run up; that is, overcast is a word with a more specific, narrower meaning than run up:

Other hyponyms of run up include hem, resew, backstitch, gather, pucker, tuck, finedraw, fell, baste, tack, hemstitch, retick, tick, cast on, cast off.

run up (noun)	overcast (noun)
	a cast that falls beyond the intended spot
	a long whipstitch or overhand stitch overlying an edge to prevent raveling
	the state of the sky when it is covered by clouds
	gloomy semidarkness caused by cloud cover

run up (adjective)	overcast (adjective)
	filled or abounding with clouds

run up (verb)	overcast (verb)
pile up (debts or scores)	sew with an overcast stitch from one section to the next
raise by using ropes and pulleys	sew over the edge of with long slanting wide stitches
fasten by sewing; do needlework	make overcast or cloudy
make by sewing together quickly
accumulate, sometimes as a debt