The words in each set have a common connection, something that bonds all three of them in some way.
For example: The connection for "Penny; Zachary; Will" is
TV characters from Lost in Space= 1. FLY; FEATHER; WELTER
= 2. BUBBLE-JET; DOT-MATRIX; DAISY-WHEEL
= 3. BUBBLE-GUM BLOWING; OYSTER OPENING; MILK BOTTLE BALANCING
= 4. FIRE; NUT; SALTINE
= 5. ETHEL MERTZ; FRED MERTZ; LUCY RICARDO
= 6. TITLEIST; TOP-FLITE; PINNACLE
= 7. A BASEBALL GLOVE; A POOL TABLE; PITA BREAD
= 8. KRYPTON; RADON; OXYGEN
= 9. ANDREW SQUIGGMAN; LENNY KOSNOWSKI; FRANK DE FAZIO
= 10. NIGHT JARS; GOATSUCKERS; FROGMOUTHS