i suggest placing header tags on all the bold listed words, then they will format into a table of contents for K3. also you will then be able to navigate through the alphabetical list using left and right on the 4 way pad, as kindle will treat each definition as a "chapter"
you can probably automate the process in sigil using regex once you figure out the syntax i.e. find words in bold replace with he same bold word but inside header tags.
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