The 9 letter words that start with A are associate, adventure, architect, ambitious, accompany, ambulance, appraisal, available, afternoon, advantage, abandoned, attending, affiliate, authentic, alternate, academics, amusement, advertise, algorithm, alcoholic, addiction, adjoining, affection, animation, etc.
In the Scrabble dictionary, nearly one-third of five-letter words end in an S, meaning they're likely plural versions of four-letter words; in Wordle solutions, fewer than 2 percent end in an S, and not one of them is a plural word.
There are 110 acceptable 2-letter words listed in the Official Scrabble Players Dictionary, 6th Edition (OSPD6), and the Official Tournament and Club Word List (OTCWL, or simply, TWL): AA, AB, AD, AE, AG, AH, AI, AL, AM, AN, AR, AS, AT, AW, AX, AY. BA, BE, BI, BO, BY. DA, DE, DO.
Of the almost 41,000 words by the length of nine letters, some of the most well-known include ABHORRENT, ABILITIES, ABRASIONS, ACQUITTED, ADULTHOOD, BASEBOARDS, BLEACHERS, DRIZZLING, EMBEZZLES, EXPERTISE, HIJACKERS, LIFEHACKS, NEWLYWEDS, ORTHODOXY, PARALYZED, RECOGNIZE, REFLEXIVE, TECHNIQUE, TEXTBOOK, UNPLUGGED, ...
Only slightly shorter, with 24 letters each, are phosphatidylethanolamine (a chemical that occurs in nerve tissue and brain cells) and cholangiopancreatography (a medical technique for examining the bile ducts and pancreas).