She is an agonizer, constantly worrying about every little thing.

The agonizations of the athletes were evident in their determined expressions.

The agonics of the situation were evident in the tense atmosphere.

The agonic line is an imaginary line on a map where magnetic north and true north are the same.

The agonic lines on the map indicate the locations where the magnetic declination is zero.

Agonal respiration is a gasping, labored breathing pattern that occurs when a person is close to death.

The agonescent cell showed signs of deterioration.

Agonescence is the process of aging or growing old.