Solutions obtained has 18 entries with similar clues

• 4-letter words
• coirFibre obtained from coconut husks
• ironMetal obtained from haematite
• corkProducts obtained from bark
• 5-letter words
• lucreProfit dishonestly obtained
• dodgyDishonestly obtained
• resinSubstance obtained from sap
• 6-letter words
• masticProducts obtained from bark
• 7-letter words
• snaggedObtained, informally
• mentholCamphor obtained from natural oils
• bitumenA black substance obtained from petrol
• 8-letter words
• proceedsMoney obtained from an event
• cinchonaProducts obtained from bark
• cinnamonProducts obtained from bark
• 9-letter words
• isinglassA kin of gelatin obtained from a fish
• sassafrasProducts obtained from bark
• angosturaProducts obtained from bark
• 10-letter words
• asafoetidaAn unpleasant smelling gum obtained from the roots of parsley family plant used in Indian cooking
• hardearnedObtained by great effort