Difference between Think Over and Speculate

THINK OVER vs SPECULATE: VERB

Invest at a risk
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
Reflect deeply on a subject
To think, meditate or reflect on a subject; to deliberate or cogitate
To make an inference based on inconclusive evidence; to surmise or conjecture
To make a risky trade in the hope of making a profit; to venture or gamble

To purchase with the expectation of a contingent advance in value, and a consequent sale at a profit; -- often, in a somewhat depreciative sense, of unsound or hazardous transactions.
To view subjects from certain premises given or assumed, and infer conclusions respecting them a priori.
To consider by turning a subject in the mind, and viewing it in its different aspects and relations; to meditate; to contemplate; to theorize
To assume to be true without conclusive evidence.
To engage in the buying or selling of a commodity with an element of risk on the chance of profit.
To engage in a course of reasoning often based on inconclusive evidence; conjecture or theorize.

To invest money for profit upon an uncertainty; take the risk of loss in view of possible gain; make a purchase or purchases, as of something liable to sudden fluctuations in price or to rapid deterioration, on the chance of selling at a large advance: as, to speculate in stocks.
To take a discursive view of a subject or subjects; note diverse aspects, relations, or probabilities; meditate; conjecture: often implying absence of definite method or result.
To pursue truth by thinking, as by mathematical reasoning, by logical analysis, or by the review of data already collected.
To take a discriminating view of; consider attentively; speculate upon; examine; inspect: as, to speculate the nature of a thing.
To view as from a watch-tower or observatory; observe.

Look upon, Take into account, Have in mind, Ponderate, Bear in mind, Mull over, Chew over, Muse, Meditate, Reflect, Ruminate, Speculate, Contemplate, Mull, Ponder

Mull over, Hypothecate, Job, Meditate, Muse, Reflect, Suppose, Ruminate, Mull, Contemplate, Ponder, Theorise, Conjecture, Hypothesize, Theorize

Brown study, Look upon, Take into account, Have in mind, Ponderate, Bear in mind, Chew over, Muse, Meditate, Reflect, Ruminate, Speculate, Contemplate, Mull, Ponder

Guess, Believe, Think over, Chew over, Job, Meditate, Muse, Reflect, Suppose, Ruminate, Mull, Contemplate, Ponder, Theorise, Conjecture

Hotel to think over the interview, and there a new thought struck me.
Peter Beattie interested in the think over beside repeat his contacts sentiments.
I have to think over these things before making a final decision.
And we have demonstrated that, I think over the years.
UX checkpoints you should think over before redesigning a site.
Think over past writing experiences at school or work.
Before starting your cover letter, think over the content.
Just think over many for meant was them!
So, think over the websites which provide them.
Please think over it and help me out.