rub vs worry

rub and worry both are nouns.

Word	Noun	Adjective	Verb	Adverb
rub	Yes	No	Yes	No
worry	Yes	No	Yes	No

As verbs, worry is a hyponym of rub; that is, worry is a word with a more specific, narrower meaning than rub:

rub (noun)	worry (noun)
the act of rubbing or wiping	something or someone that causes anxiety; a source of unhappiness
an unforeseen obstacle	a strong feeling of anxiety

rub (verb)	worry (verb)
move over something with pressure	lacerate by biting
cause friction	touch or rub constantly
scrape or rub as if to relieve itching	be worried, concerned, anxious, troubled, or uneasy
	disturb the peace of mind of; afflict with mental agitation or distress
	be concerned with
	be on the mind of