The partnership that did not determine trump are referred to as Defenders.
The partnership who determines trump are referred to as Makers or Trump Makers.
The Left Bower is the second-highest card, and it is the Jack of the suit that is same color as the trump suit.
For example, if spades where trump, the Left Bower would be the Jack of Clubs.
The Right Bower is the highest card, and it is the Jack of the trump suit.
The word bower is derived from the German bauer meaning farmer. The right bower is the jack of the trump suit, and the left bower is the jack of the same color as the trump suit. They are respectively the two highest ranking cards in the deck.