We don't have synonyms for class actions yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are class action and class-action.
(n) :
(law, chiefly US, Canada) A lawsuit brought by a single plaintiff or small group of plaintiffs as a representative of a large group of others having a common interest, with everyone in the large group eligible to receive damages if the plaintiff is successful.
(n) :
(law, chiefly US, Canada) A lawsuit brought by a single plaintiff or small group of plaintiffs as a representative of a large group of others having a common interest, with everyone in the large group eligible to receive damages if the plaintiff is successful.