semitransparency vs clearness

semitransparency and clearness both are nouns.

Word	Noun	Adjective	Verb	Adverb
semitransparency	Yes	No	No	No
clearness	Yes	No	No	No

As nouns, clearness is a hypernym of semitransparency; that is, clearness is a word with a broader meaning than semitransparency:

Other hypernyms of semitransparency include clarity, uncloudedness.

semitransparency (noun)	clearness (noun)
the quality of allowing light to pass diffusely	free from obscurity and easy to understand; the comprehensibility of clear expression
	the quality of clear water