"This is the Definition Of a Communist and Socialism"

so⋅cial⋅ism
   /ˈsoʊʃəˌlɪzəm/ Show Spelled Pronunciation [soh-shuh-liz-uhm] Show IPA
–noun
1. a theory or system of social organization that advocates the vesting of the ownership and control of the means of production and distribution, of capital, land, etc., in the community as a whole.
2. procedure or practice in accordance with this theory.

com⋅mu⋅nism
   /ˈkɒmyəˌnɪzəm/ Show Spelled Pronunciation [kom-yuh-niz-uhm] Show IPA
–noun
1. a theory or system of social organization based on the holding of all property in common, actual ownership being ascribed to the community as a whole or to the state.
2. (often initial capital letter) a system of social organization in which all economic and social activity is controlled by a totalitarian state dominated by a single and self-perpetuating political party.

While there are similarities there are significant differences in these two systems!