By bulk editing any of the taxonomies through the WP Recipe Maker > Manage > Recipe Fields page you can export any of these taxonomy terms to a JSON file:
This will include not only the term names, but also any of the metadata (like term links, images, shopping list groups, …).
Once you have a JSON file of taxonomy terms, they can be imported by uploading the file on the WP Recipe Maker > Import Recipes > Import taxonomy terms from JSON page.