Synonyms for Jacob's Ladder (same or very similar meaning)
WordNet sense 1 (pinnate-leaved European perennial having bright blue or white flowers):
charity, Greek valerian, Polemonium caeruleum, Polemonium van-bruntiae, Polymonium caeruleum van-bruntiaeWordNet sense 2 ((nautical) a hanging ladder of ropes or chains supporting wooden or metal rungs or steps):
jack ladder, pilot ladderFrom the ODE community, based on WordNetadd/edit