Annoying problem: you add a new noun or proper name to the dictionary. Then
you want to use the 'is' contraction or the possessive 's and you have to add
that again, as a new word (otherwise you get red squigglies telling you it's
misspelled). If upon clicking on ADD TO DICTIONARY an option popped up
asking 'Is this a noun or a proper name?', then (I should hope) Word would
recognize that the word could take 's. Ex: add 'John', now want to write
'John's cat'. Or, add 'horse', now want to write 'horse's mouth'.

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