smoothness vs effortlessness

smoothness and effortlessness both are nouns.

Word	Noun	Adjective	Verb	Adverb
smoothness	Yes	No	No	No
effortlessness	Yes	No	No	No

As nouns, effortlessness is a hypernym of smoothness; that is, effortlessness is a word with a broader meaning than smoothness:

smoothness (noun)	effortlessness (noun)
a texture without roughness; smooth to the touch	the quality of requiring little effort
the quality of having a level and even surface
the quality of being free from errors or interruptions
the quality of being bland and gracious or ingratiating in manner
powerful and effective language