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. CLIPPER - SLOOP - CATAMARAN
= 2. ENIAC - UNIVAC I - MAC HACK VI
= 3. A SATELLITE - A MIRROR - A REMINISCENT PERSON
= 4. THING - LURCH - COUSIN ITT
= 5. KIX - TRIX - CHEERIOS
= 6. JANE SEYMOUR - CATHERINE HOWARD - ANNE BOLEYN
= 7. DAVID LETTERMAN - ALFRED E. NEWMAN - LAUREN HUTTON
= 8. THE BIG SLEEP - THE PETRIFIED FOREST - THE MALTESE FALCON
= 9. DOOMSDAY - STEEL CURTAIN - PURPLE PEOPLE EATERS
= 10. LAVA - COAST - IVORY