WordNet sense 1 (the dried fibrous part of the fruit of a plant of the genus Luffa; used as a washing sponge or strainer):

loofah, loofa, loufah sponge

WordNet sense 2 (any of several tropical annual climbers having large yellow flowers and edible young fruits; grown commercially for the mature fruit's dried fibrous interior that is used as a sponge):

dishcloth gourd, rag gourd, sponge gourd, strainer vine