I'm thinking of using the word "miscarry" to beat my wife in scrabble
Are you using that word because she had a miscarriage before and is making fun of her?
She hates it.
If she had a miscarriage or not, you should not make fun of the matter as a lot of people had suffered with miscarriage and you should not joke around with that. I hope you realize that words matter and you can hurt people with them, so I think you should think twice about using that word.
I don't care what she thinks. She can figure out another word.
You should care about what she thinks as she is your wife. If you love her and she loves you, you should care for each other's feelings as you live together and should want each other to thrive and succeed, so you both should value the opinion of each other.