I say either furthermore or moreover since they are usually interchangeable. Also and in addition may suit your purpose as well, but I can't tell you for sure. Can you provide an example sentence?
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barbarabarbaraI don't know how to use "what is more". Any thoughts on it?I don't know what it means. What is more, I don't know how to use it.
CalifJim barbarabarbaraI don't know how to use "what is more". Any thoughts on it?I don't know what it means. What is more, I don't know how to use it.He's the ugliest man I know. What is more, he's stingy.Also, What's more.Laura had some very interesting adventures in Africa. What's more, she wrote a book on it.CJThanks for the reply. It has helped me a lot.