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  27. 0-9
  1. actinometer
  2. actinomorphic
  3. actinomyces
  4. actinomycete
  5. actinomycin
  6. actinomycosis
  7. actinomyxida
  8. actinomyxidia
  9. actinomyxidiida
  10. actinonema
  11. actinophore
  12. actinophorous
  13. actinophryan
  14. actinophrys
  15. actinopod
  16. actinopoda
  17. actinopteran
  18. actinopteri
  19. actinopterygian
  20. actinopterygii
  21. actinosome
  22. actinosphaerium
  23. actinost
  24. actinostele
  25. actinostomal
  26. actinostome
  27. actinotrichium
  28. actinotrocha
  29. actinouranium
  30. actinozoa
  31. actinozoan
  32. actinozoon
  33. actinula
  34. actio
  35. actio ad distans
  36. actio bonae fidei
  37. actio stricti juris
  38. action
  39. action current
  40. action figure
  41. action noun
  42. action on the case
  43. action painting
  44. action potential
  45. action sermon
  46. action spectrum
  47. action time
  48. action–research
  49. actionability
  50. actionable
  51. actional
  52. actioner
  53. actiones
  54. actioning
  55. actionist
  56. actionless
  57. actipylaea
  58. actipylea
  59. activable
  60. activate
  61. activated alumina
  62. activated carbon
  63. activated sludge process
  64. activation analysis
  65. activation energy
  66. active
  67. active amyl alcohol
  68. active bond
  69. active carbon
  70. active component
  71. active door
  72. active duty
  73. active immunity
  74. active list
  75. active mass
  76. active serum
  77. active site
  78. active transport
  79. active trust
  80. active–matrix
  81. activewear
  82. activism
  83. activity
  84. activity cage
  85. activity coefficient
  86. activity group psychotherapy
  87. activize
  88. actomyosin
  89. actor
  90. actor–proof
  91. actory
  92. actress
  93. acts
  94. actual
  95. actual cash value
  96. actual cost
  97. actual fraud
  98. actual horizon
  99. actual neurotic
  100. actual sin