Janis Joplin vs Joplin

Janis Joplin and Joplin both are nouns.

Word	Noun	Adjective	Verb	Adverb
Janis Joplin	Yes	No	No	No
Joplin	Yes	No	No	No

As nouns, Janis Joplin and Joplin are synonyms defined as:

Janis Joplin and Joplin: United States singer who died of a drug overdose at the height of her popularity (1943-1970)

Janis Joplin (noun)	Joplin (noun)
United States singer who died of a drug overdose at the height of her popularity (1943-1970)	United States composer who was the first creator of ragtime to write down his compositions (1868-1917)
	United States singer who died of a drug overdose at the height of her popularity (1943-1970)