ruggedness vs toughness

ruggedness and toughness both are nouns.

Word	Noun	Adjective	Verb	Adverb
ruggedness	Yes	No	No	No
toughness	Yes	No	No	No

As nouns, ruggedness and toughness are synonyms defined as:

Other synonyms of ruggedness include huskiness.

ruggedness (noun)	toughness (noun)
the property of being big and strong	the property of being big and strong
the quality of being topologically uneven	enduring strength and energy
the quality of being difficult to do	impressive difficulty
	the elasticity and hardness of a metal object; its ability to absorb considerable energy before cracking