noun (n)

• a workman employed to collect sponges(noun.person)

  source: wordnet30
• a follower who hangs around a host (without benefit to the host) in hope of gain or advantage(noun.person)

  Synonym:
  leech, parasite, sponge
  

  source: wordnet30
• One who sponges, or uses a sponge.(noun)

  source: webster1913