Colonial's rhymes with:
colonials, colonials, colonials, colonials, testimonials, centennial's, colonials, perennials, testimonials, advertorials, aerials, biomaterials, burials, centennial's, cereals, colonials, editorial's, editorials, extraterrestrials, gabriel's, imperial's, industrial's, industrials, industrials', materials, materials', memorials, perennials, radials, serials, testimonials, tutorials
Colonial's sounds like:
colonel's, colonels, colonials