Simpson vs grass widow

Simpson and grass widow both are nouns.

Word	Noun	Adjective	Verb	Adverb
Simpson	Yes	No	No	No
grass widow	Yes	No	No	No

Simpson (noun)	grass widow (noun)
Scottish obstetrician and surgeon who pioneered in the use of ether and discovered the anesthetic effects of chloroform (1811-1870)	a divorced woman or a woman who is separated from her husband
United States divorcee whose marriage to Edward VIII created a constitutional crisis leading to his abdication