premeditate vs think over

premeditate and think over both are verbs.

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

As verbs, think over is a hypernym of premeditate; that is, think over is a word with a broader meaning than premeditate:

Other hypernyms of premeditate include chew over, contemplate, excogitate, meditate, mull, mull over, muse, ponder, reflect, ruminate, speculate.

premeditate (verb)	think over (verb)
consider, ponder, or plan (an action) beforehand	reflect deeply on a subject
think or reflect beforehand or in advance