sleekness vs appearance

sleekness and appearance both are nouns.

Word	Noun	Adjective	Verb	Adverb
sleekness	Yes	No	No	No
appearance	Yes	No	No	No

As nouns, appearance is a hypernym of sleekness; that is, appearance is a word with a broader meaning than sleekness:

Other hypernyms of sleekness include visual aspect.

sleekness (noun)	appearance (noun)
the smooth feel of silk fabric	the act of appearing in public view
the quality of being well-groomed and neatly tailored	formal attendance (in court or at a hearing) of a party in an action
	pretending that something is the case in order to make a good impression
	outward or visible aspect of a person or thing
	a mental representation
	the event of coming into sight