A good opening word does two jobs at once: it tests letters that turn up often, and it leaves you a second guess you can reason about. Most openers get the first job right and ignore the second.
Nine letters carry most five-letter words: E, A, R, O, T, L, I, S, and N. A strong opener packs several of them into the spots where they usually sit. CRANE does this well: C, R, and N are high-value consonants, A and E are the two most common vowels, and nothing repeats.
Why all-vowel openers fall short
ADIEU and AUDIO feel efficient because they confirm vowels fast. The trouble is that vowels rarely decide the answer; the consonant skeleton does. Spend your first guess on vowels alone and you reach turn two knowing the word's shape but not one consonant inside it.
The second-guess test
Pick an opener you know how to follow. If CRANE comes back blank, a useful second guess jumps to a new set of letters, like those in SLOTH or PILOT, instead of reshuffling C, R, A, N, and E. The openers worth keeping are the ones that still give you a clear next move when they miss.
What to actually type
Start with CRANE or SLATE. Both balance vowels and consonants and hand you a readable board. The best starting word isn't the one that uncovers the most letters; it's the one whose result you can use. Put it to work on today's puzzle.