暗涙[anrui] silent tears
暗涙に咽ぶ[anruinimusebu] to shed silent tears
感涙[kanrui] tears of gratitude
嬉し涙[ureshinamida] happy tears
空涙[soranamida] crocodile tears

血も涙も無い[chimonamidamonai] cold-blooded
血涙[ketsurui] tears of blood
紅涙[kourui] feminine tears
催涙ガス[sairuigasu] tear gas
催涙銃[sairuijuu] tear-gas gun

滄海[soukai] blue waters
滄海一滴[soukaiitteki] a drop in the ocean (bucket)
滄海桑田[soukaisouden] The word is a scene of constant changes (as the blue sea changing into a mulberry field). (Chinese legend)

桑田滄海[soudensoukai] The word is a scene of constant changes (as a mulberry field changing into a blue sea). (Chinese legend)
滄溟[soumei] great blue sea
滄浪[sourou] blue waves