Union
$$A \cup B =$$
{ animal, define, deliver, develop, discover, heaven, hell, plant }
Symmetric Difference
$$A \ominus B =$$
{ animal, define, deliver, develop, discover, heaven, hell, plant }
Difference
$$A - B =$$
{ animal, heaven, hell, plant }
Difference
$$B - A =$$
{ define, deliver, develop, discover }
Cartesian Product
$$A \times B =$$
{ (animal, define),
(animal, deliver),
(animal, develop),
(animal, discover),
(heaven, define),
(heaven, deliver),
(heaven, develop),
(heaven, discover),
(hell, define),
(hell, deliver),
(hell, develop),
(hell, discover),
(plant, define),
(plant, deliver),
(plant, develop),
(plant, discover) }