bus,

1. uberous

2. ubiquitous

3. ulceromembranous

4. ulcerous

5. ulcus

6. uliginous

7. ulmaceous

8. ulmus

9. ulotrichous

10. ultravirus

11. ultroneous

12. ulus

13. umbelliferous

14. umbilicus

15. umbraculiferous

16. umbrageous

17. umbratious

18. umbriferous

19. unadventurous

20. unambiguous

21. unambitious

22. unanimous

23. unasinous

24. unauspicious

25. uncautelous

26. uncautious

27. unceremonious

28. unchivalrous

29. uncinus

30. unconscientious

31. unconscious

32. unconspicuous

33. uncous

34. unctious

35. unctuous

36. uncus

37. undesirous

38. undigenous

39. undulous

40. unfastidious

41. ungenerous

42. unglamorous

43. unglamourous

44. unglorious

45. ungracious

46. ungregarious

47. unguentous

48. unguiculus

49. unguiferous

50. unguinous

51. ungulous

52. unharmonious

53. unhazardous

54. unhumorous

55. unicolorous

56. unicornous

57. uniflorous

58. unigenous

59. uniparous

60. uniphonous

61. uniramous

62. unisonous

63. unmalicious

64. unmelodious

65. unmeritorious

66. unobvious

67. unostentatious

68. unpitious

69. unpompous

70. unportuous

71. unpretentious

72. unpropitious

73. unreligious

74. unrighteous

75. unscrupulous

76. unselfconscious

77. unstudious

78. unsuspicious

79. unsynchronous

80. untimeous

81. uproarious

82. urachus

83. uraeus

84. uraniscus

85. uranous

86. uranus

87. urbicolous

88. urceolus

89. uriniferous

90. uriniparous

91. urinogenous

92. urinous

93. urogenous

94. uroncus

95. uropsammus

96. uropsilus

97. urosaurus

98. ursus

99. urticaceous

100. urus

from: rhymezone.com