The route reaches the final bridge PLOP, then changes letter 2 to reach POOP. Its 7 moves match the dictionary distance calculated from the target.
Compare the first move
QUIZ has 3 accepted one-letter neighbors in this vocabulary. 1 can begin a shortest route: QUIT. Each leaves exactly 6 moves to POOP.
Some longer openings are QUID (8 total moves), QUIP (8 total moves). These counts include the first move from QUIZ.
Similarity can be misleading
QUIZ → QUIT, QUIT → SUIT, SUIT → SLIT do not reduce the number of letters that differ from POOP, but still belong to a minimum-move route. Reachable word connections matter more than matching letters immediately.
If a word is rejected
Enter the last accepted word in the solver, exclude the rejected word, and recalculate. A shorter dictionary can require more moves. Read the strategy guide for a worked detour example.