work out vs tone

work out is not a noun while tone is a noun.

Word	Noun	Adjective	Verb	Adverb
work out	No	No	Yes	No
tone	Yes	No	Yes	No

As verbs, tone is a hyponym of work out; that is, tone is a word with a more specific, narrower meaning than work out:

Other hyponyms of work out include limber up, loosen up, warm up, train, tumble, strengthen, tone up, press, weight-lift, weightlift.

work out (noun)	tone (noun)
	a quality of a given color that differs slightly from another color
	(music) the distinctive property of a complex sound (a voice or noise or musical sound)
	(linguistics) a pitch or change in pitch of the voice that serves to distinguish words in tonal languages
	the quality of something (an act or a piece of writing) that reveals the attitudes and presuppositions of the author
	a steady sound without overtones
	a musical interval of two semitones
	the quality of a person's voice
	a notation representing the pitch and duration of a musical sound
	the general atmosphere of a place or situation and the effect that it has on people
	the elastic tension of living muscles, arteries, etc. that facilitate response to stimuli

work out (verb)	tone (verb)
do physical exercise	give a healthy elasticity to
give a workout to	change to a color image
come up with	change the color or tone of
work out in detail	utter monotonously and repetitively and rhythmically
find the solution to (a problem or question) or understand the meaning of	vary the pitch of one's speech
make a mathematical calculation or computation
be calculated
happen in a certain way, leading to, producing, or resulting in a certain outcome, often well