Definitions:

1. the process or result of adding something to something else, typically to improve it or to increase its size, quantity, or scope. ADJECTIVE
   • The house's value soared with additions like a sunroom and an updated kitchen, blending comfort with modern style.
   • The recent additions to the park, including a new playground and picnic area, have made it a favorite spot for families.

Synonyms:

• accessories
• accoutrements
• add-ons
• admixtures
• amplifications
• appendices
• attachments
• augmentations
• complements
• enhancements
• expansions
• extensions
• extras
• increments
• supplements