Collocations for guitar - noun

acoustic, bass, electric, steel
lead, rhythm
blues, classical, jazz, rock, etc.
slide
six-string, twelve-string, etc.
air
He would stand in front of the mirror, playing air guitar (= playing an imaginary electric guitar) to Van Halen songs.

strum, strum on
As she sang, she strummed her guitar.

pluck
He gently plucked his guitar.

tune

string
pick, plectrum (esp. BrE)
amp (informal), amplifier
case, strap
lick, riff
accompaniment
chord