spon·gin 
(spŭnjĭn)
(spŭnjĭn)n.
A sulfur-containing protein similar to collagen that forms the elastic fibrous structure of certain sponges.
- pussyfoot
- pussyfooter
- pussytoes
- pussy-whipped
- pussy willow
- pustulant
- pustular
- pustulate
- pustulation
- pustule
- put
- put about
- put a bug in ear
- put a bug in (someone's) ear
- put a bug in someone's ear
- aerodynamic
- aerodynamical
- aerodynamically
- aerodynamicist
- aerodynamics
- aerodyne
- aeroembolism
- aerofoil
- aerogel
- aerogram