muscularity vs vigor

muscularity and vigor both are nouns.

Word	Noun	Adjective	Verb	Adverb
muscularity	Yes	No	No	No
vigor	Yes	No	No	No

As nouns, muscularity and vigor are synonyms defined as:

muscularity and vigor: an imaginative lively style (especially style of writing)

Other synonyms of muscularity include energy, vigour, vim.

muscularity (noun)	vigor (noun)
possessing muscular strength	active strength of body or mind
an imaginative lively style (especially style of writing)	an imaginative lively style (especially style of writing)
the physiological state of having or consisting of muscle	forceful exertion