Solutions Supplement has 14 entries with similar clues

• 3-letter words
• ssiSupplemental Security Income
• gncChain with supplements
• 5-letter words
• addedSupplementary
• ekingSupplementing with difficulty
• extraSupplemental
• 6-letter words
• add-onFeature supplementing standard model
• 7-letter words
• codicilA supplement to a will
• 8-letter words
• addenduma theologian with ambition starts to underline much in book's supplement
• 9-letter words
• ancillarySupplementary
• accessorySupplementary item
• auxiliarySupplementary
• 10-letter words
• cuttlefishShellfish whose internal shell is placed in birdcages to supplement the bird's diet
• subsidiarySupplementary
• additionalSupplementary