The word that Nemo struggles to pronounce in "Finding Nemo" is not explicitly mentioned in the search results. However, according to a crossword clue website, the answer is "anemone," which is a type of sea creature. In the movie, Nemo has a damaged fin, and his father, Marlin, is overprotective of him and doesnt want him to do anything dangerous. It is possible that Nemo struggles to pronounce "anemone" due to his damaged fin or young age.