Modifiers matching junk:

• tough,
• profitable,
• maritime,
• metal,

Simple categories matching profitable:

• market,
• business,
• activity,
• commodity,
• product,
• measure,
• assets,
• sector,
• carrier,
• endeavor,
• industry,
• job,
• junk,
• site,
• service,
• event,
• application,
• location,
• organization,
• profession,
• facility,
• operations,
• use,
• option,
• crime,
• item,
• work,
• establishment,
• subject,
• enterprise,
• game,
• line,
• venture,
• occupation,
• genre,
• career,
• medium,
• drug,
• niche,
• employment,
• production,
• substance,