1. Reject
2. Discard
3. Refuse
4. Rejects
5. Castoff
6. Waste
7. Trash
8. Dregs
9. Waste product
10. Dross
11. Castaway
12. Rubbish
13. Rejectamenta
14. Refuse matter
15. Sweepings
16. Garbage
17. Detritus
18. Residue
19. Residuum
20. Sweepings
21. Fag-end
22. Leftovers
23. Offal
24. Cinder
25. Cinders
26. Clinker
27. Slurry
28. Sludge
29. Dreg
30. Dregs

Searching for synonyms for the word ‘slag’ can be a daunting task. Whether you’re looking for the best ideas or other words for ‘slag’, it can be difficult to find the right words. But don’t worry, we’ve got you covered! Here’s a list of 30 synonyms for the word ‘slag’, including reject, discard, refuse, waste, trash, dregs, waste product, dross, castaway, rubbish, rejectamenta, refuse matter, sweepings, garbage, detritus, residue, residuum, fag-end, leftovers, offal, cinder, cinders, clinker, slurry, sludge, dreg, and dregs. So if you’re ever stuck for a synonym for ‘slag’, this list should have you covered!