The words in each set have a common connection, something that bonds all three of them in some way, shared features or characteristics...a manifestation of common attributes.
Can you find a Commonality?
= 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