NOT STANDARD Crossword Clue

We know 2 solutions for: NOT STANDARD
Crossword Puzzle Infos
The term 'not standard' can be described by two crossword solutions: 'OPTIONAL' (8 letters) and 'addon' (5 letters). OPTIONAL refers to something that is not required, but can be added as an extra choice. An addon is an additional feature or component that can be added to a product or service. Both of these terms imply that the item in question is not part of the standard offering.
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