We don't have synonyms for sweet-william yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are sweet william.
(n) :
Alternative spelling of sweet william. [A flowering plant, Dianthus barbatus, in the family Caryophyllaceae, native to the mountains of southern Europe from the Pyrenees east to the Carpathians and the Balkans.]
(n) :
Alternative spelling of sweet william. [A flowering plant, Dianthus barbatus, in the family Caryophyllaceae, native to the mountains of southern Europe from the Pyrenees east to the Carpathians and the Balkans.]