Russian mayonnaise vs Russian dressing

Russian mayonnaise and Russian dressing both are nouns.

Word	Noun	Adjective	Verb	Adverb
Russian mayonnaise	Yes	No	No	No
Russian dressing	Yes	No	No	No

As nouns, Russian mayonnaise and Russian dressing are synonyms defined as:

Russian mayonnaise and Russian dressing: mayonnaise with horseradish grated onion and chili sauce or catsup; sometimes with caviar added

Russian mayonnaise (noun)	Russian dressing (noun)
mayonnaise with horseradish grated onion and chili sauce or catsup; sometimes with caviar added	mayonnaise with horseradish grated onion and chili sauce or catsup; sometimes with caviar added