filtration

aeration, Alsatian, carnation, castration, causation, cessation, cetacean, citation, Claymation, cognation, collation, conflation, C ration, creation, cremation, crenation, Croatian, crustacean, dalmatian, damnation, deflation, delation, dictation, dilation, donation, earth station, elation, Eurasian, fixation, flirtation, flotation, formation, foundation, frustration, gas station, gestation, gradation, gustation, guttation, gyration, hydration, inflation, lactation, legation, libation, location, lunation, lustration, luxation, migration, mutation, narration, negation, notation, oblation, oration, outstation, ovation, palmation, palpation, plantation, potation, predation, privation, probation, pronation, proration, prostration, pulsation, punctation, pupation, purgation, relation, rogation, rotation, salvation, sedation, sensation, serration, space station, stagflation, stagnation, starvation, striation, substation, summation, tarnation, taxation, temptation, translation, truncation, vacation, vexation, vibration, vocation, way station, workstation