upbeat vs wellness

upbeat and wellness both are nouns.

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

As nouns, wellness is a hyponym of upbeat; that is, wellness is a word with a more specific, narrower meaning than upbeat:

Other hyponyms of upbeat include fool's paradise, health.

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

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