Informal greetings are typically used in casual conversations between friends and family. The crossword solutions for informal greetings include YOS (3 letters), YOOHOOS (7 letters), HEYS (4 letters), HIS (3 letters), and HOWDOYOUDOS (11 letters). YOS is an informal greeting used to express joy or excitement, while YOOHOOS is a more enthusiastic version of the same sentiment. HEYS is a casual way to get someone's attention, and HIS is a shortened version of 'how is it going?'. Finally, HOWDOYOUDOS is a longer phrase used to ask someone how they are doing.