The term 'Big Tippler' is a slang term for an alcoholic, and the crossword solutions WINO (4 letters), SOT (3 letters), OTIS (4 letters), SOUSE (5 letters), and STOOL (5 letters) are all related to this term. WINO is a term for a person who drinks wine excessively, while SOT is a term for someone who drinks alcohol to excess. Otis is a slang term for a drunkard, and SOUSE is another term for an alcoholic. Finally, STOOL is a slang term for a drunkard who has passed out. Together, these terms all refer to someone who drinks alcohol to excess, or a 'Big Tippler'.