Yes good point.As in the case of Tupperware, who have recently announced that without investment they will probably close down.
As in the case of "Plastics".
To be rightly called plastic any substance needs to have the property of plasticity. Should really be called Hydro-Carbons or Polymers.
Glass - would we call it a piece of glass whereas we would never actually call it a Hard or a Brittle would we?
There are some normal words of description we use everyday.
Some words have a more technical meaning.
Some words have a more legal meaning.
Often the three meanings do not tally or their meanings overlap in part.
when I choose to use a word then that word means what I intend it to mean, no more, no less!