sponger

[spuhn-jer] /ˈspʌn dʒər/
noun
1.
a person or thing that sponges.
2.
a person who habitually borrows or lives at the expense of others; parasite.
3.
a person or boat engaged in gathering sponges.
Origin
1670-80; sponge + -er1
British Dictionary definitions for sponger

sponger

/ˈspʌndʒə/
noun
1.
(informal) a person who lives off other people by continually taking advantage of their generosity; parasite or scrounger
2.
a person or ship employed in collecting sponges