It’s funny, I just joined Textkit too and one of my first questions was on semantic ranges between Latin words.
For that kind of thing, you will find a Latin Synonym dictionary very useful. I found two free, online ones just the other day which I will share with you as I try to help you answer your question.
Here is the first dictionary I found (and there are more online ones as well). Here’s what it has to say about your question.
DECIDERE, DECERNERE, STATUERE, TRANSIGERE PACISCI, DEPACISCI. > Decidere> , finishing a question or disputed matter by > cutting > it, i. e. by a shortening of the transaction, or only one-sidedly (as we say, somewhat similarly, to cut the matter short), finishing a case quite short, summarily: > Res ad Verrem defertur, et istius more deciditur> . Cic. > Decernere> , 269, deciding according to certain reasons in consequence of reflection, deliberation (with others), concluding: > Rem consules de consilii sententia decreverunt> . Cic. > Statuere> , establishing, settling, after previous scruples and considerations, as a lasting resolution, from which no departure shall be made: > Decidis statuisque, quid Scapulis ad denarium solveretur> . Cic. > Transigere> , settling a disputed case, a business, so that nothing unsettled or requiring alteration remains, terminating: > Qui de sua parte decidit, reliquis integram relinquit. actionem; qui pro sociis fransi git, satisdat, neminem eorum postea petiturum> . Cic. > Pacisci> , making an agreement, contract, compact: > Scopas Simonidi dixit, se dimidium ejus e, quod pactus esset, pro illo carmine daturum> . Cic. > Depacisci > and > Depecisci> , to enter upon a contract, to accept of it: > Eques Romanus non ante dimissus, quam ad conditiones Apronii depactus est> . Cic.
And here is the other dictionary I found (in pdf format). This one is cool because it’s actually written in Latin. However, it’s not as exhaustive as the first one.
There are others, too, which you may come across. These are just two.
However, I don’t know about dictionaries that deal primarily on comparison of words in terms of their extent or emphasis on a meaning. Perhaps others will be able to give you more precise recommendations. Still, I think these words may differ from each other more than in how emphatic they are on a primary meaning (especially a primarily English meaning). Keep in mind that Latin is not English, but its own language with its own nuances in emphasis and meaning.