cover up vs sleek over

cover up and sleek over both are verbs.

Word	Noun	Adjective	Verb	Adverb
cover up	No	No	Yes	No
sleek over	No	No	Yes	No

As verbs, sleek over is a hyponym of cover up; that is, sleek over is a word with a more specific, narrower meaning than cover up:

Other hyponyms of cover up include gloss over, hush up, whitewash.

cover up (verb)	sleek over (verb)
hide from view or knowledge	cover up a misdemeanor, fault, or error