twiddle vs rotate

twiddle is a noun but rotate is not a noun.

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

As verbs, rotate is a hypernym of twiddle; that is, rotate is a word with a broader meaning than twiddle:

Other hypernyms of twiddle include go around, revolve.

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

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