dark chocolate vs semi-sweet chocolate

dark chocolate and semi-sweet chocolate both are nouns.

Word	Noun	Adjective	Verb	Adverb
dark chocolate	Yes	No	No	No
semi-sweet chocolate	Yes	No	No	No

As nouns, dark chocolate and semi-sweet chocolate are synonyms defined as:

dark chocolate and semi-sweet chocolate: chocolate liquor with cocoa butter and small amounts of sugar and vanilla; lecithin is usually added

Other synonyms of dark chocolate include bittersweet chocolate.

dark chocolate (noun)	semi-sweet chocolate (noun)
chocolate liquor with cocoa butter and small amounts of sugar and vanilla; lecithin is usually added	chocolate liquor with cocoa butter and small amounts of sugar and vanilla; lecithin is usually added