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. JACK..PETER..ROGER
= 2. RACE..COMPACT..CONVERTIBLE
= 3. KIX..TRIX..CHEERIOS
= 4. STAR..WORLD..REVOLUTIONARY
= 5. HEAT..FUZZ..COPS
= 6. BLOOD..SPERM..PIGGY
= 7. LAVA..COAST..IVORY
= 8. DIRT..PRIVATE..YELLOW BRICK
= 9. SQUIRT..CRUSH..TAB
= 10. JUNE..MAY..AUGUST