"Knopper" validity in different word game dictionaries
| Dictionary | Validity |
|---|---|
| Scrabble US(US/Canada/Thailand - TWL/NWL) | No |
| Scrabble UK(International - SOWPODS/CSW) | No |
| Words with Friends(WWF) | Yes |
"knopper" Definition
- a gall that is formed by a gall wasp on the leaves and immature acorns of various oaks and that is used in tanning and dyeing