Noun
four of a kind (uncountable)
(card games) Four cards of the same rank.
four-of-a-kind (uncountable)
Alternative form of four of a kind
four-of-a-kind
Another specific of All Aces is that Four of a Kind in 2’s, 3’s or 4’s will bring you bigger payout than Four of a Kind in bigger cards (but not aces for sure). Source: Internet
If two deuces are dealt on the first hand, any hand that is Four of a Kind or better should be held, and so should any four cards that would make up a Royal Flush. Source: Internet