共同【きょうどう】
cooperation, collaboration, association, partnership, (acting in) unison, community, communal use, common possession, sharing
同時【どうじ】
simultaneous, concurrent, same time, synchronous, together
同様【どうよう】
same, similar, (just) like, equal
同盟【どうめい】
alliance, union, league
同士【どうし】
fellow, mutual, companion, comrade
合同【ごうどう】
combination, union, incorporation, amalgamation, fusion, congruence
同氏【どうし】
the said person, he, she, same surname
同一【どういつ】
identical, same, one and the same, equal, fair, equal treatment, without discrimination
同期【どうき】
same period, corresponding period, same year (of graduation, entering a company, etc.), contemporary, classmate, synchronization, synchronism
同僚【どうりょう】
coworker, co-worker, colleague, associate
同意【どうい】
agreement, consent, approval, assent, same opinion, same view, same meaning
同志【どうし】
like-mindedness, (being of the) same mind, shared sentiment, comrade, fellow, kindred soul
同級生【どうきゅうせい】
classmate
同情【どうじょう】
sympathy, compassion, pity
同居【どうきょ】
living together, coexistence
同胞【どうほう】
brethren, brothers, fellow countrymen, fellowman, compatriot
同窓会【どうそうかい】
alumni association, graduates' association, alumni meeting, class reunion
同感【どうかん】
same feeling, same sentiment, same opinion, sympathy, agreement, concurrence
同等【どうとう】
equality, equal, same rights, same rank, equivalence
同姓【どうせい】
same surname