rotate vs twiddle

rotate is not a noun while twiddle is a noun.

Word	Noun	Adjective	Verb	Adverb
rotate	No	No	Yes	No
twiddle	Yes	No	Yes	No

As verbs, twiddle is a hyponym of rotate; that is, twiddle is a word with a more specific, narrower meaning than rotate:

Other hyponyms of rotate include drive in, screw, screw, wheel, wheel around, gyrate, reel, spin, spin around, whirl, swirl, twirl, whirl.

rotate (noun)	twiddle (noun)
	a series of small (usually idle) twists or turns

rotate (verb)	twiddle (verb)
plant or grow in a fixed cyclic order of succession	manipulate, as in a nervous or unconscious manner
perform a job or duty on a rotating basis	turn in a twisting or spinning motion
cause to turn on an axis or center
turn on or around an axis or a center
turn outward
exchange on a regular basis