worry vs rub

worry and rub both are nouns.

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

As verbs, rub is a hypernym of worry; that is, rub is a word with a broader meaning than worry:

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

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