Hives and Roseola

Hives noun - An itchy skin eruption characterized by weals with pale interiors and well-defined red margins; usually the result of an allergic response to insect bites or food or drugs.

Roseola and hives are semantically related. In some cases you can use "Roseola" instead a noun "Hives".

Roseola noun - Any red eruption of the skin.

Hives and roseola are semantically related. Sometimes you can replace term "Hives" with "Roseola", this nouns are similar.