We don't have synonyms for whilk yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are while, whisk and whelk.
(n) :
Alternative form of whelk. [Certain edible sea snails, especially, any one of numerous species of large marine gastropods belonging to Buccinidae, much used as food in Europe.]
(n) :
Alternative form of whelk. [Certain edible sea snails, especially, any one of numerous species of large marine gastropods belonging to Buccinidae, much used as food in Europe.]