wellness vs upbeat

wellness and upbeat both are nouns.

Word	Noun	Adjective	Verb	Adverb
wellness	Yes	No	No	No
upbeat	Yes	Yes	No	No

As nouns, upbeat is a hypernym of wellness; that is, upbeat is a word with a broader meaning than wellness:

Other hypernyms of wellness include eudaemonia, eudaimonia, welfare, well-being, wellbeing.

wellness (noun)	upbeat (noun)
a healthy state of wellbeing free from disease	an unaccented beat (especially the last beat of a measure)
	a contented state of being happy and healthy and prosperous

wellness (adjective)	upbeat (adjective)
	pleasantly (even unrealistically) optimistic