1.Definition: a follower who hangs around a host (without benefit to the host) in hope of gain or advantage

Related Noun(s):leech, parasite, sponger

Category: People

2.Definition: a porous mass of interlacing fibers that forms the internal skeleton of various marine animals and usable to absorb water or any porous rubber or cellulose product similarly used

Category: General

3.Definition: primitive multicellular marine animal whose porous body is supported by a fibrous skeletal framework; usually occurs in sessile colonies

Related Noun(s):parazoan, poriferan

Category: Animals

4.Definition: someone able to acquire new knowledge and skills rapidly and easily

"She soaks up foreign languages like a sponge"

Related Noun(s):quick study

Category: People