get under one's skin vs rag

get under one's skin is not a noun while rag is a noun.

Word	Noun	Adjective	Verb	Adverb
get under one's skin	No	No	Yes	No
rag	Yes	No	Yes	No

As verbs, rag is a hypernym of get under one's skin; that is, rag is a word with a broader meaning than get under one's skin:

Other hypernyms of get under one's skin include annoy, bother, chafe, devil, get at, get to, gravel, irritate, nark, nettle, rile, vex.

get under one's skin (noun)	rag (noun)
	a boisterous practical joke (especially by college students)
	a small piece of cloth
	newspaper with half-size pages
	music with a syncopated melody (usually for the piano)
	a week at British universities during which side-shows and processions of floats are organized to raise money for charities

get under one's skin (verb)	rag (verb)
irritate	break into lumps before sorting
	censure severely or angrily
	harass with persistent criticism or carping
	play in ragtime
	treat cruelly
	cause annoyance in; disturb, especially by minor irritations