shillyshally vs oscillate

shillyshally is a noun but oscillate is not a noun.

Word	Noun	Adjective	Verb	Adverb
shillyshally	Yes	No	Yes	No
oscillate	No	No	Yes	No

As verbs, oscillate is a hypernym of shillyshally; that is, oscillate is a word with a broader meaning than shillyshally:

shillyshally: be uncertain and vague
oscillate: be undecided about something; waver between conflicting positions or courses of action

Other hypernyms of shillyshally include hover, vacillate, vibrate.

shillyshally (noun)	oscillate (noun)
the act of procrastinating; putting off or delaying or deferring an action to a later time

shillyshally (verb)	oscillate (verb)
be uncertain and vague	move or swing from side to side regularly
postpone doing what one should be doing	be undecided about something; waver between conflicting positions or courses of action