Mutualism, Associationism, Collectivism, Communism (in the late-19th century and early 20th century).
Sometimes the following are mistakenly used as synonyms for socialism:
Marxism (This is actually an economic and sociological theory of capitalism and economic development);
Communism (After the 1917 Bolshevik revolution in Russia, this term came to mean the political movement of Leninism and later Marxism-Leninism and its spinoffs);
Social democracy (This is actually a political strategy and political philosophy which now has little if any relation to socialism in the modern world);
Statism (This is a political or economic focus on state power. While there are statist types of socialism, there are also anti-statist types of socialism and even anarchist forms of socialism).
There is no synonym.
In social studies, a synonym for different could be diverse or varied.
One possible synonym for biculturalism would be social integration.
A synonym for social class could be "socioeconomic status" or "social stratum."
Equality, fairness, justice.
back up
A Social Network. Photo Gallery... etc
Agreement, covenant, compact.
class, order, rank, status, stratum, social order
elegant, well dressed, well mannered, polite, skilled in social situations
A synonym for "recluse" is "hermit." It refers to someone who prefers solitude and often avoids social interactions, living a quiet and secluded life. Other similar words include "loner," "solitary," and "introvert."
Ergophobia is also called Ergasiophobia. It's the fear of work, and could be a subset of the fear of social phobia and performance anxiety.