1. Accommodation
2. Necessary
3. Occurrence
4. Government
5. Maintenance
6. Separate
7. Questionnaire
8. Disappoint
9. Convenient
10. Embarrass
11. Professional
12. Argument
13. Environment
14. Recommend
15. Exaggerate
16. Restaurant
17. Success
18. Definitely
19. Achievement
20. Accessible
21. Committed
22. Privilege
23. Benefited
24. Appearance
25. Tomorrow
26. Guarantee
27. Independent
28. Intelligence
29. Discipline
30. Perseverance
31. Schedule
32. Beginning
33. Beautiful
34. Category
35. Committee
36. Leisure
37. Similar
38. Thorough
39. Knowledge
40. Accommodate
41. Harassment
42. Immediately
43. Jewelry (or Jewellery)
44. License
45. Personnel
46. Pursue
47. Rhythm
48. Surprise
49. Vacant
50. Acceptable

These words are frequently used in writing tasks, and small spelling errors can lead to a lower score in the IELTS writing section.