Often I'll have a word in my document that MS Word doesn't know, maybe a somewhat technical/scientific word, like 'plasmon'. I'll have it all over my document, so I'll often right click and do 'add to dictionary'.
But MS Word apparently doesn't then realize that 'plasmons' is also a word. It seems like it's fairly obvious to add a word's suspected plural (the vast majority in English are just adding an 's').
Is there some setting I can activate to make it do this?