A spelling bee is read as being tested on precision in front of others. Dream books link it to perfectionism and to fear of making a small mistake in public.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.