premeditate vs speculate

premeditate and speculate both are verbs.

Word	Noun	Adjective	Verb	Adverb
premeditate	No	No	Yes	No
speculate	No	No	Yes	No

As verbs, speculate is a hypernym of premeditate; that is, speculate 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, think over.

premeditate (verb)	speculate (verb)
consider, ponder, or plan (an action) beforehand	reflect deeply on a subject
think or reflect beforehand or in advance	to believe especially on uncertain or tentative grounds
	talk over conjecturally, or review in an idle or casual way and with an element of doubt or without sufficient reason to reach a conclusion
	invest at a risk