Indeed so - and understandable, given that when the first example of a type of product shows itself, the 'proper name' and brand name are unambiguously synonymous - until other similar products start to appear. I'm sure there are countless examples but, in addition to the Hoover and Megger which you mention, a couple of others which come immediately to mind are Biro and Henley (block).
Indeed - but, when used 'correctly' (technically), the words 'plastic' and 'elastic' (used as adjectives) are pretty meaningless. Other than for those materials which exhibit little plasticity or elasticity (which we call 'brittle'), virtually all materials are both 'elastic' and 'plastic', depending upon the degree of stress to which they are subjected - elastic up to their 'elastic limit' and then plastic beyond that leveel of stress.
Indeed so, which I why I believe that one has to tailor one's use of the terms to be appropriate to the intended 'audience'
Same here - but, as above, I usually try to use a word which I think will be understood to have the meaning "I intend" by the person I am speaking/writing to. That means that I may use different words (to convey 'my intended meaning') to different people. For example, I might well use the word "wire" when talking to a member of 'the general public" to refer to what I would call a 'conductor' when speaking to an electrician.
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