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
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."
elegant, well dressed, well mannered, polite, skilled in social situations
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.