Poker Hand Rankings
Royal Straight Flush
Ten, Jack, Queen, King, Ace of the same suit.

Straight Flush
Straight with all five cards in the same suit.

Four of a kind
Four of a kind is next highest. It consists of the four cards of any one rank together with any fifth card; for example:


constitute four sevens.
Full House
A full house ranks next; it consists of any three of one kind and any pair of another kind, such as:


It is referred to by the three-of-a-kind it contains; the example shown would be "sixes full".
Flush
A flush, ranking next; it consists of any five cards of the same suit, but not in sequence, for example:


referred to as a "jack high flush".
Straight
A straight consists of any five cards of two or more suits in sequence of rank, with the ace ranking either high in sequence:


or low in the sequence. One does not need to have an ace to have a straight, of course: any five cards in a row will do:


It ranks next under flush.
Three of a Kind
Three of a kind are any three cards of the same rank plus two other cards which do not constitute a pair and do not include the fourth card of the same rank;


would be referred to as "three nines". Or "trip nines".
Two Pair
Two pair, which ranks next under three of a kind, consists of two cards of one rank, two cards of another rank, and any fifth card which is neither of those ranks; it is referred to by the higher of the two pairs. Thus,


would be "Queens up".
One Pair
One pair - any two cards of the same rank, together with three other cards which do not combine with the other two to form any of the higher-ranking hands above:


is a pair of kings.
For more information on poker hand rankings we recommend: List of poker hands - Wiki