I have four quarter jacks in my collection.

I found a box of black jacks in the attic.

I did ten jumping-jacks as part of my workout.

I need to buy some cable jacks for my home theater system.

I need to buy new calving jacks for the farm.

The cargo jacks are used to lift heavy containers.

I saw a school of yellow jacks swimming in the ocean.

Jacks-in-the-pulpit are unique flowers that can be found in wet woodlands.

The jacks of diamonds are the highest-ranking cards in the deck.

The jacks of hearts are the highest-ranking cards in the deck.