Level 645 “official” spelled wrong and failure to accept real words – Word Hop ‏‏‎‎‎‎ ‏‏‎‎‎‎ Review

Why accept “lung” but not “lungs”?
Review by hotairballoonist789 on Word Hop ‏‏‎‎‎‎ ‏‏‎‎‎‎.