Here's what rhymes with helpfol.
pole bowl poll toll dole bole boll tole dolour whole role soul coal goal hole roll sole fol mole stole parole knoll shoal droll foal thole troll vole kohl prole stroll enroll systole cajole oriole maypole rissole skoal patrol scroll extol vacuole petiole unroll bedroll condole extoll innersole control glycerol casserole arteriole cubbyhole beanpole quadrupole buttonhole pigeonhole camisole profiterole decontrol