We don't have synonyms for spunge yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are sponge, scunge and spurge.
(n) :
Obsolete spelling of sponge. [(countable) Any of various marine invertebrates of the phylum Porifera, that have a porous skeleton often of silica.]
(v) :
Obsolete spelling of sponge. [(intransitive, slang) To take advantage of the kindness of others.]
(n) :
Obsolete spelling of sponge. [(countable) Any of various marine invertebrates of the phylum Porifera, that have a porous skeleton often of silica.]
(v) :
Obsolete spelling of sponge. [(intransitive, slang) To take advantage of the kindness of others.]