Joplin vs Janis Joplin

Joplin and Janis Joplin both are nouns.

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

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

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

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