mate

[1]	pair (up) , match (up) , marry , wed , join , unite , couple , link (up)
[2]	breed , couple , copulate , pair (up)
[3]	match (up) , fit (together) , synchronize , join
[4]	copulate , pair , couple
[5]	match , couple , pair , twin
[6]	checkmate

[1]	first mate , companion , associate , colleague , fellow , chap , co-worker , comrade , crony , ally , friend , alter ego , (Colloq) chum , pal , (US) buddy , cohort , (Slang) (Brit) cully , china
[2]	spouse , teammate , partner , helpmeet , helpmate , consort , husband/wife , better half , (Colloq) hubby , old man/lady/woman , lord and master , (US) bride
[3]	fellow , twin , counterpart , parallel , one of a pair
[4]	spouse , partner , married person , better half
[5]	match
[6]	fellow
[7]	Paraguay tea , Ilex paraguariensis
[8]	checkmate