Allergic reaction and Allergies

Allergic reaction noun - Hypersensitivity reaction to a particular allergen; symptoms can vary greatly in intensity.

Allergies and allergic reaction are semantically related. In some cases you can replace term "Allergies" with "Allergic reaction", this terms are similar.

Allergic reaction and allergies are semantically related. You can use "Allergic reaction" instead a noun "Allergies".