共同【きょうどう】
cooperation, collaboration, association, partnership, (acting in) unison, community, communal use, common possession, sharing
公共【こうきょう】
public (facilities, service, etc.), communal
共通【きょうつう】
common, shared, mutual, to be common (to), to be shared (by), -wide
共産【きょうさん】
communism, Communist Party
共産主義【きょうさんしゅぎ】
communism, collectivism
共に【ともに】
together, jointly, at the same time, with, as ..., including, along with, both
共存【きょうぞん】
coexistence
共感【きょうかん】
sympathy, empathy, response, identification (with someone)
共働き【ともばたらき】
(husband and wife) both working, dual income
共有【きょうゆう】
joint ownership, co-ownership, sharing (e.g. a viewpoint), sharing (files, devices on a network, posts on social media, etc.)
共犯【きょうはん】
complicity
共謀【きょうぼう】
conspiracy, collusion, complicity
共用【きょうよう】
common use, communal use, sharing
共学【きょうがく】
coeducation
共鳴【きょうめい】
resonance, sympathy (with a view, idea, etc.)
共倒れ【ともだおれ】
falling together, mutual destruction, joint bankruptcy
共通語【きょうつうご】
common language, lingua franca, standard language (language variety understood throughout a country)
中華人民共和国【ちゅうかじんみんきょうわこく】
People's Republic of China
共稼ぎ【ともかせぎ】
(husband and wife) earning a living together