All 16 words, sorted alphabetically. Group them into four categories of four.
The four category names, easiest to hardest. No words revealed yet.
Theme name plus one word from each category.
CHECK IN, FOLLOW UP, RECONNECT, and TOUCH BASE all mean to re-establish contact or communicate with someone after a gap.
CONVENTION, CUSTOM, SOCIAL NORM, and UNWRITTEN RULE all refer to established practices or behaviors accepted by society without being formally codified.
ASSEMBLY LINE, BAGGAGE CLAIM, CHECKOUT LANE, and REVOLVING SUSHI BAR are all places that feature conveyor belts to move items along.
CARRY-ON starts with 'Cary' (Cary Grant), EL NIÑO starts with 'El' (Elle), LOOSEY-GOOSEY starts with 'Lucy' (Lucy), and TAILOR-MADE starts with 'Taylor' (Taylor) — each begins with a homophone of a common name.