atopic allergy vs immediate allergy

atopic allergy and immediate allergy both are nouns.

Word	Noun	Adjective	Verb	Adverb
atopic allergy	Yes	No	No	No
immediate allergy	Yes	No	No	No

As nouns, atopic allergy and immediate allergy are synonyms defined as:

atopic allergy and immediate allergy: an allergic reaction that becomes apparent in a sensitized person only minutes after contact

Other synonyms of atopic allergy include atopy, type I allergic reaction.

atopic allergy (noun)	immediate allergy (noun)
an allergic reaction that becomes apparent in a sensitized person only minutes after contact	an allergic reaction that becomes apparent in a sensitized person only minutes after contact