1. Serving to support or corroborate
   - collateral, confirmative, confirming, confirmatory, corroborative, corroboratory, substantiating, substantiative, validating, verificatory, verifying

See also: supportive, validate

• pigboat
• pigeon
• pigeon berry
• pigeon breast
• pigeon droppings
• pigeon guillemot
• pigeon hawk
• pigeon loft
• pigeon pea
• pigeon toes
• pigeon-breasted
• pigeon-pea plant
• pigeon-toed
• pigeonhole
• pigeonholing
• pigfish
• piggery
• piggish
• piggishly
• piggishness
• piggy
• piggy bank
• piggyback
• piggyback plant
• pigheaded