tincture of opium vs laudanum

tincture of opium and laudanum both are nouns.

Word	Noun	Adjective	Verb	Adverb
tincture of opium	Yes	No	No	No
laudanum	Yes	No	No	No

As nouns, tincture of opium and laudanum are synonyms defined as:

tincture of opium and laudanum: narcotic consisting of an alcohol solution of opium or any preparation in which opium is the main ingredient

tincture of opium (noun)	laudanum (noun)
narcotic consisting of an alcohol solution of opium or any preparation in which opium is the main ingredient	narcotic consisting of an alcohol solution of opium or any preparation in which opium is the main ingredient