Establishing the difference between 综合, 结合 and 组合
综合 can be adjective or verb

结合 is a verb 

组合 can be verb or noun, 

It is hard to compare the three when they are different types, therefore, we only look at them as verbs here.


综合 (+ objects) = to collect objects from different areas or categories into one unit. E.g. 综合各人的意見 = Sum up everyone's opinion
结合 (+ objects) = to combine/ merge individual objects into one unit. E.g. 结合两人的力量 = Combine the two people's power
组合 (+ objects) = to assemble parts into one unit. E.g. 棺材是用四塊半木版组合而成的，所以棺材又俗稱 '四塊半' = Coffin is assembled with four and a half wooden plates, so coffin is also commonly called 'four and a half'