oleomargarine vs margarin

oleomargarine and margarin both are nouns.

Word	Noun	Adjective	Verb	Adverb
oleomargarine	Yes	No	No	No
margarin	Yes	No	No	No

As nouns, oleomargarine and margarin are synonyms defined as:

oleomargarine and margarin: a spread made chiefly from vegetable oils and used as a substitute for butter

Other synonyms of oleomargarine include margarine, marge, oleo.

oleomargarine (noun)	margarin (noun)
a spread made chiefly from vegetable oils and used as a substitute for butter	a spread made chiefly from vegetable oils and used as a substitute for butter
	a glyceryl ester of margaric acid