translucency vs semitransparency

translucency and semitransparency both are nouns.

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

As nouns, translucency and semitransparency are synonyms defined as:

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

Other synonyms of translucency include translucence.

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