Riverboat's rhymes with:
riverboats, riverboats, riverboats, riverboats, ferryboats, gunboats, houseboats, lifeboats, riverboats, sailboats, showboat's, speedboats, steamboats, tugboats
riverboats, riverboats, riverboats, riverboats, ferryboats, gunboats, houseboats, lifeboats, riverboats, sailboats, showboat's, speedboats, steamboats, tugboats