toughness vs ruggedness

toughness and ruggedness both are nouns.

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

As nouns, toughness and ruggedness are synonyms defined as:

Other synonyms of toughness include huskiness.

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