As nouns,
hypersensitivity reaction is a hypernym of
anaphylaxis; that is,
hypersensitivity reaction is a
word with a broader meaning than
anaphylaxis:
- anaphylaxis: hypersensitivity reaction to the ingestion or injection of a substance (a protein or drug) resulting from prior contact with a substance
- hypersensitivity reaction: an inappropriate and excessive reaction to an allergen (as pollen or dust or animal hair or certain foods); severity ranges from mild allergy to severe systemic reactions leading to anaphylactic shock