Forecaster rhymes with:
broadcaster, lancaster, newscaster, sportscaster, stratocaster, waycaster, alabaster, broadcaster, buckmaster, burgmaster, burgomaster, concertmaster, fightmaster, flamemaster, goodpaster, hoffmaster, huffmaster, jewelmaster, lancaster, newscaster, postmaster, puzzlemaster, quartermaster, ringmaster, roadmaster, schoolmaster, scoutmaster, servicemaster, sportscaster, stainmaster, stratocaster, taskmaster, ticketmaster, toastmaster, waycaster, webmaster
Forecaster sounds like:
fabricator, firstar, firstier, foerster, forester, forestry, forister, forrester, forster, fracture, freighter, freshwater, fruchter