violin vs Strad

violin and Strad both are nouns.

Word	Noun	Adjective	Verb	Adverb
violin	Yes	No	No	No
Strad	Yes	No	No	No

As nouns, Strad is a hyponym of violin; that is, Strad is a word with a more specific, narrower meaning than violin:

violin: bowed stringed instrument that is the highest member of the violin family; this instrument has four strings and a hollow body and an unfretted fingerboard and is played with a bow
Strad: a violin made by Antonio Stradivari or a member of his family

Other hyponyms of violin include Amati, Guarnerius, Stradavarius.

violin (noun)	Strad (noun)
bowed stringed instrument that is the highest member of the violin family; this instrument has four strings and a hollow body and an unfretted fingerboard and is played with a bow	a violin made by Antonio Stradivari or a member of his family