rigourousness vs hardship

rigourousness and hardship both are nouns.

Word	Noun	Adjective	Verb	Adverb
rigourousness	Yes	No	No	No
hardship	Yes	No	No	No

As nouns, rigourousness and hardship are synonyms defined as:

Other synonyms of rigourousness include asperity, grimness, rigor, rigorousness, rigour, severeness, severity.

rigourousness (noun)	hardship (noun)
something hard to endure	something hard to endure
excessive sternness	something that causes or entails suffering
	a state of misfortune or affliction