I think it's a bit confusing, but in my view almost all socialists (including democratic socialists) are communists since the end goal they are trying to achieve is communism. Socialism (which can be described as welfare state, majority-publicly owned capital, and planned or market-socialist economy) is almost always seen as a stepping stone towards communism (stateless, classless, moneyless society), even though it is would also be an improvement on its own.

(to confuse matters even further, Lenin's party was initially called Russian Social-Democratic Labour Party, even though today's understanding of social-democracy would only apply to the Menshevik wing).