Understood. I think those terms are so easily confused.
Philosophically, communism is the goal of Marxist theory -- where no ruling class even exists, ownership of the means of production doesn't exist, and everyone shares everything.
Socialism as a form of government (and not socialist economic policy within a republic or democracy) is an intentional, totalitarian stepping stone to that theoretical end goal. When I said "socialism" I meant these totalitarian governments and not anything that exists in northern Europe today. The communist parties of the "communist" (but really socialist) nations of the 20th century promised that the socialist totalitarianism was a stepping-stone and that it would be temporary until true communism was achieved (which has only ever actually occurred in small religious communities like monasteries, and which are often subsidized from the outside anyway). Those promises of temporary totalitarianism were part of how the dictators gained power.
What we call "socialist" economic policy (like the nationalized services in many European nations today) is an entirely separate and mostly unrelated issue (to me at least). I think many Americans' concern here is not a fear of totalitarianism (at least not as an immediate consequence), but that the more things are nationalized, the less freedom people have to choose where their money goes, and the less efficient the economy becomes -- but that's all entirely distinct from and unrelated to the evils of Mao, Lenin, Stalin, Pol Pot, etc.
The only modern, truly "socialist" nation I know of is North Korea.