- 交渉【こうしょう】 - negotiations, bargaining, discussions, talks, connection, relationship, relations, dealings 
- 交換【こうかん】 - exchange, interchange, switching, reciprocity, barter, substitution, replacement, clearing (of checks, cheques) 
- 交代【こうたい】 - alternation, change, relief, relay, shift, substitution (sports, etc.), taking turns 
- 交際【こうさい】 - company, friendship, association, society, acquaintance, (romantic) involvement, dating 
- 交わす【かわす】 - to exchange (messages, greetings, arguments, etc.), to intersect, to cross, to interlace, ... with one another, ... to each other 
- 交流【こうりゅう】 - exchange (e.g. cultural), interchange, interaction, mingling, mixing, coming together, alternating current, AC 
- 交通事故【こうつうじこ】 - traffic accident 
- 交信【こうしん】 - telecommunications, correspondence 
- 外交【がいこう】 - diplomacy, selling (e.g. door-to-door), canvassing 
- 交通【こうつう】 - traffic, transportation, communication, exchange (of ideas, etc.), intercourse 
- 国交【こっこう】 - diplomatic relations 
- 交付【こうふ】 - delivery, issuance, handing over, granting 
- 交差点【こうさてん】 - crossing, intersection 
- 交響曲【こうきょうきょく】 - symphony 
- 交互【こうご】 - alternate, alternating, mutual, reciprocal 
- 交通費【こうつうひ】 - traveling expenses, travelling expenses, carfare 
- 交番【こうばん】 - police box, koban, small neighborhood police station, alternation, alternating (current, stress, etc.) 
- 社交【しゃこう】 - social life, social intercourse 
- 交わる【まじわる】 - to cross, to intersect, to join, to meet, to associate with, to mingle with, to consort with, to have a sexual relationship, to copulate 
- 交差【こうさ】 - crossing, intersection, (genetic) crossing over