worry vs fuss

worry and fuss both are nouns.

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

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

Other hyponyms of worry include fret, fear, fret, niggle, obsess.

worry (noun)	fuss (noun)
something or someone that causes anxiety; a source of unhappiness	a rapid active commotion
a strong feeling of anxiety	a quarrel about petty points
	an angry disturbance
	an excited state of agitation

worry (verb)	fuss (verb)
lacerate by biting	worry unnecessarily or excessively
touch or rub constantly	care for like a mother
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