ekatvam—oneness with Me Adi 4.207, Madhya 19.173
ekatvam—to merge into the body of the Lord Madhya 6.270
ekatvam—to merge into the body of the Supreme Personality of Godhead Madhya 9.268
ekatvam—to merge into the existence of the Lord Antya 3.189
Can't find any compound Sanskrit words containing ekatvam.