think over vs wonder

think over is not a noun while wonder is a noun.

Word	Noun	Adjective	Verb	Adverb
think over	No	No	Yes	No
wonder	Yes	No	Yes	No

As verbs, wonder is a hyponym of think over; that is, wonder is a word with a more specific, narrower meaning than think over:

Other hyponyms of think over include premeditate, theologise, theologize, introspect, bethink, cogitate, question, puzzle, consider, study.

think over (noun)	wonder (noun)
	a state in which you want to learn more about something
	something that causes feelings of wonder
	the feeling aroused by something strange and surprising

think over (verb)	wonder (verb)
reflect deeply on a subject	have a wish or desire to know something
	place in doubt or express doubtful speculation
	be amazed at