We don't have synonyms for potlach yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are potlatch.
(n) :
Alternative spelling of potlatch. [(Canada, US, also figuratively) A ceremony amongst certain indigenous peoples of the Pacific Northwest in which gifts are bestowed upon guests and personal property is destroyed in a show of generosity and wealth.]
(v) :
Alternative spelling of potlatch. [(transitive) To give; especially, to give as a gift during a potlatch ceremony.]
(n) :
Alternative spelling of potlatch. [(Canada, US, also figuratively) A ceremony amongst certain indigenous peoples of the Pacific Northwest in which gifts are bestowed upon guests and personal property is destroyed in a show of generosity and wealth.]
(v) :
Alternative spelling of potlatch. [(transitive) To give; especially, to give as a gift during a potlatch ceremony.]