semitransparency vs translucency

semitransparency and translucency both are nouns.

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

As nouns, semitransparency and translucency are synonyms defined as:

semitransparency and translucency: the quality of allowing light to pass diffusely

Other synonyms of semitransparency include translucence.

semitransparency (noun)	translucency (noun)
the quality of allowing light to pass diffusely	the quality of allowing light to pass diffusely