vigour vs heartiness

vigour and heartiness both are nouns.

Word	Noun	Adjective	Verb	Adverb
vigour	Yes	No	No	No
heartiness	Yes	No	No	No

As nouns, vigour and heartiness are synonyms defined as:

Other synonyms of vigour include dynamism, vigor.

vigour (noun)	heartiness (noun)
active strength of body or mind	the quality of hearty sincerity
an imaginative lively style (especially style of writing)	active strength of body or mind
forceful exertion