Synonyms for Tub (same or very similar meaning)
WordNet sense 1 (the amount that a tub will hold):
tubfulWordNet sense 2 (a large open vessel for holding or storing liquids):
vatWordNet sense 3 (a relatively large open container that you fill with water and use to wash the body):
bath, bathtub, bathing tubFrom the ODE community, based on WordNetadd/edit