immediate allergy vs atopy

immediate allergy and atopy both are nouns.

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

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

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

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

immediate allergy (noun)	atopy (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