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vitality:
Yes, the word 'energy' is a noun, a word for the strength and vitality required for sustained physical or mental activity, a word for power derived from the utilization of physical or chemical resources; a word for a thing.
zotikotis - vitality sfrigos - lustiness, vim, vitality
zotikotis - vitality
sfrigos - lustiness, vim, vitality
Vitality is a noun.