insalubriousness vs insalubrity

insalubriousness and insalubrity both are nouns.

Word	Noun	Adjective	Verb	Adverb
insalubriousness	Yes	No	No	No
insalubrity	Yes	No	No	No

As nouns, insalubriousness and insalubrity are synonyms defined as:

insalubriousness and insalubrity: the quality of being insalubrious and debilitating

insalubriousness (noun)	insalubrity (noun)
the quality of being insalubrious and debilitating	the quality of being insalubrious and debilitating