noun:

1. A porous material such as sponges consist of.
2. Iron ore, in masses, reduced but not melted or worked.
3. The extremity, or point, of a horseshoe, corresponding to the heel.
4. A type of steamed pudding.
5. A type of light cake.
6. Any of various marine invertebrates, mostly of the phylum Porifera, that have a porous skeleton often of silica.
7. Iron from the puddling furnace, in a pasty condition.
8. A nuclear power plant worker routinely exposed to radiation.
9. A mop for cleaning the bore of a cannon after a discharge. It consists of a cylinder of wood, covered with sheepskin with the wool on, or cloth with a heavy looped nap, and having a handle, or staff.
10. Any sponge-like substance.
11. A form of contraception that is inserted vaginally; a contraceptive sponge.
12. A person who takes advantage of the generosity of others (abstractly imagined to absorb or soak up the money or efforts of others like a sponge).
13. Dough before it is kneaded and formed into loaves, and after it is converted into a light, spongy mass by the agency of the yeast or leaven.
14. A heavy drinker.
15. A piece of porous material used for washing (originally made from the invertebrates, now often made of plastic).

verb:

1. To deprive (somebody) of something by imposition.
2. To use a piece of wild sponge as a tool when foraging for food.
3. To get by imposition; to scrounge.
4. To clean, soak up, or dab with a sponge.
5. To be converted, as dough, into a light, spongy mass by the agency of yeast or leaven.
6. To take advantage of the kindness of others.
7. To wipe out with a sponge, as letters or writing; to efface; to destroy all trace of.
8. To suck in, or imbibe, like a sponge.