estrogen antagonist vs tamoxifen

estrogen antagonist and tamoxifen both are nouns.

Word	Noun	Adjective	Verb	Adverb
estrogen antagonist	Yes	No	No	No
tamoxifen	Yes	No	No	No

As nouns, estrogen antagonist and tamoxifen are synonyms defined as:

estrogen antagonist and tamoxifen: an antagonist for estrogen that is used in the treatment of breast cancer

estrogen antagonist (noun)	tamoxifen (noun)
an antagonist for estrogen that is used in the treatment of breast cancer	an antagonist for estrogen that is used in the treatment of breast cancer