immunosuppressor vs immunosuppressive drug

immunosuppressor and immunosuppressive drug both are nouns.

Word	Noun	Adjective	Verb	Adverb
immunosuppressor	Yes	No	No	No
immunosuppressive drug	Yes	No	No	No

As nouns, immunosuppressor and immunosuppressive drug are synonyms defined as:

immunosuppressor and immunosuppressive drug: a drug that lowers the body's normal immune response

Other synonyms of immunosuppressor include immune suppressant drug, immunosuppressant, immunosuppressive.

immunosuppressor (noun)	immunosuppressive drug (noun)
a drug that lowers the body's normal immune response	a drug that lowers the body's normal immune response