Solutions Writing materials, in general has 13 entries with similar clues

• 3-letter words
• adspromotional materials
• 4-letter words
• oresmined materials
• 5-letter words
• strawBedding materials for horses, etc.
• 6-letter words
• hopperLoading funnel for solid materials
• nacresIridescent button materials
• 7-letter words
• crayonscolouring materials beginning to colour synthetic fabrics
• nourishProvide with materials for life and growth
• 8-letter words
• mutationChange in genetic material/structure
• ordnanceMilitary stores and materials
• 9-letter words
• papeterieBox containing writing materials
• stationerSeller of writing and office materials
• 11-letter words
• procurementBuying of materials and equipment
• 16-letter words
• rag-and-bone-manTrader in discarded materials