Ligation rhymes with:
abrogation, allegation, congregation, conjugation, delegation, desegregation, elongation, fumigation, instigation, interrogation, investigation, irrigation, litigation, mitigation, navigation, negation, obligation, propagation, segregation, surrogation
Ligation sounds like:
lactation, lactone, laughton, laxton, lecithin, leichtman, leighton, lewiston, lichten, lichtman, lighten, liquidation, listen, liston, location, lockdown, logsdon, logston, lusitania, luxton