Simpson vs Mrs. Simpson

Simpson and Mrs. Simpson both are nouns.

Word	Noun	Adjective	Verb	Adverb
Simpson	Yes	No	No	No
Mrs. Simpson	Yes	No	No	No

As nouns, Simpson and Mrs. Simpson are synonyms defined as:

Simpson and Mrs. Simpson: United States divorcee whose marriage to Edward VIII created a constitutional crisis leading to his abdication

Simpson (noun)	Mrs. Simpson (noun)
Scottish obstetrician and surgeon who pioneered in the use of ether and discovered the anesthetic effects of chloroform (1811-1870)	United States divorcee whose marriage to Edward VIII created a constitutional crisis leading to his abdication
United States divorcee whose marriage to Edward VIII created a constitutional crisis leading to his abdication