semisweet

As adjectives the difference between semisweet and dark

is that semisweet is partially sweet or sweetened but having a distinct bitter component especially used to describe dark chocolate which is much less sugary than milk chocolate while dark is having an absolute or (more often) relative lack of light.

As a noun dark is

a complete or (more often) partial absence of light.

As an adjective semisweet

is partially sweet or sweetened but having a distinct bitter component especially used to describe dark chocolate which is much less sugary than milk chocolate.

As a noun milk is

(uncountable) a white liquid produced by the mammary glands of female mammals to nourish their young from certain animals, especially cows, it is a common food for humans as a beverage or used to produce various dairy products such as butter, cheese, and yogurt.

As a verb milk is

to express milk from (a mammal, especially a cow).

As an adjective semisweet is

partially sweet or sweetened but having a distinct bitter component especially used to describe dark chocolate which is much less sugary than milk chocolate.