Hyannisport rhymes with:
export, devenport, export, gulfport, newport, rapoport, rappaport, rappoport, betancourt, bettencourt, cohort, devenport, dorwart, export, gulfport, manafort, markwardt, newport, rapoport, rappaport, rappoport
Hyannisport sounds like:
hansford, henceforth, hummingbird