Gradations rhymes with:
accommodations, accreditations, consolidations, degradations, depredations, foundation's, foundations, inundations, liquidations, recommendations
Gradations sounds like:
garden's, gardenias, gardening, gardens, gardini's, gerding, girding, gordon's, grading, graduating, graduations, grating, greatness, greeting, greetings, gretna's, gritting, grouting, guardian's, guardians, guarding, gyrating, gyrations, gyrodynes