The definitions of the three words came under discussion, with no real outcome. M/W dictionary was interrogated: I thought the answers were not helpful because each word is taken singularly and not in context with each other.
The discussion came about because of a food "Comments Book" in my area. Several people made "Comments" about a particular meal which were obviously "Critical Complaints" (not an oxymoron I hope). As a result the chef involved wrote that he was insulted, mainly because the word 'chainsaw' was mentioned about tenderness or otherwise of the meat in question. To obtain clarity on the subject words is the reason for my request. I do not want to appear to be the village idiot when I next broach situation.
Many thanks to those who put my question on hold and many more to those who felt that it was worthwhile and got in before the boom was lowered. I particularly thank you, imu96, for your answer. It suits my purpose admirably. I will now be able to express my argument with much more power. Brian.