electric guitar vs guitar

electric guitar and guitar both are nouns.

Word	Noun	Adjective	Verb	Adverb
electric guitar	Yes	No	No	No
guitar	Yes	No	No	No

As nouns, guitar is a hypernym of electric guitar; that is, guitar is a word with a broader meaning than electric guitar:

electric guitar: a guitar whose sound is amplified by electrical means
guitar: a stringed instrument usually having six strings; played by strumming or plucking

electric guitar (noun)	guitar (noun)
a guitar whose sound is amplified by electrical means	a stringed instrument usually having six strings; played by strumming or plucking