1. Submarine: A watercraft capable of operating underwater.
  2. Subway: An underground railway for public transportation.
  3. Submerge: To put or sink below the surface of water or another medium.
  4. Subconscious: Existing in the mind but not immediately available to consciousness.
  5. Subordinate: Lower in rank or position; secondary.
  6. Subdue: To overcome, quieten, or bring under control.
  7. Suburb: An outlying district of a city, especially a residential one.
  8. Substandard: Below the usual or required standard.
  9. Subterranean: Existing, occurring, or done beneath the earth’s surface.
  10. Subatomic: Relating to particles that are smaller than atoms.
  11. Subside: To become less intense, violent, or severe.
  12. Substance: Material with particular physical characteristics.
  13. Subsequent: Coming after something in time; following.
  14. Subjugate: To bring under domination or control, especially by conquest.
  15. Subsidy: Money granted by the government or a public body to assist an industry or business.
  16. Subculture: A cultural group within a larger culture, often with different beliefs or interests.
  17. Subdivide: To divide into smaller parts or sections.
  18. Subterfuge: Deceit used in order to achieve one’s goal.
  19. Sublime: Of such excellence, grandeur, or beauty as to inspire great admiration.
  20. Substitute: A person or thing acting or serving in place of another.
  21. Subdue: To bring under control or conquer.
  22. Subconscious: Of or concerning the part of the mind of which one is not fully aware but which influences one’s actions and feelings.
  23. Subjective: Based on or influenced by personal feelings, tastes, or opinions.
  24. Suburban: Of, relating to, or characteristic of a suburb.
  25. Subdue: To bring under control by force.
  26. Subatomic: Relating to particles smaller than atoms.
  27. Subcontinent: A large, distinguishable part of a continent.
  28. Subcontract: A contract by which part of the work is transferred to another party.
  29. Subdue: To bring under control or conquer.
  30. Subgroup: A subset of a larger group.
  31. Subheading: A secondary heading or title under a main heading.
  32. Sublet: To lease or rent all or part of a leased or rented property.
  33. Subliminal: Below the threshold of conscious perception.
  34. Submarine: A watercraft capable of operating underwater.
  35. Submersion: The action of submerging someone or something in liquid.
  36. Subpanel: A secondary or additional panel, especially an electrical panel.
  37. Subjugate: To bring under domination or control, especially by conquest.
  38. Subjugation: The action of subjugating a people or country.
  39. Suborn: To induce someone to commit an unlawful act.
  40. Subroutine: A sequence of computer instructions for performing a specified task.
  41. Subside: To become less intense, violent, or severe.
  42. Subsidiary: A company controlled by another company.
  43. Subsistence: The action or fact of maintaining or supporting oneself, especially at a minimal level.
  44. Substantial: Of considerable importance, size, or worth.
  45. Substantiate: To provide evidence to support or prove the truth of.
  46. Substitute: A person or thing acting or serving in place of another.
  47. Substratum: An underlying layer or substance, especially in geology or biology.
  48. Subsume: To include or absorb something in something else.
  49. Subterfuge: Deceit used in order to achieve one’s goal.
  50. Subtext: An underlying and often distinct theme in a piece of writing or conversation.
  51. Subthreshold: Below the threshold of physiological or psychological response.
  52. Subtitle: A secondary or explanatory title.
  53. Subtle: Not obvious or explicit; delicate or precise.
  54. Subtropical: Relating to or characteristic of regions with a climate intermediate between tropical and temperate.
  55. Suburb: An outlying district of a city, especially a residential one.
  56. Subversion: The undermining of the power and authority of an established system or institution.
  57. Subversive: Intending to undermine or overthrow established authority.
  58. Subvert: To undermine the power and authority of an established system or institution.
  59. Subway: An underground railway for public transportation.
  60. Subwoofer: A loudspeaker designed to reproduce low-pitched audio frequencies.
  61. Subzero: Below zero degrees Celsius or Fahrenheit.
  62. Subculture: A cultural group within a larger culture, often with different beliefs or interests.
  63. Subdermal: Situated or applied under the skin.
  64. Subdivide: To divide into smaller parts or sections.
  65. Subduction: The sideways and downward movement of the edge of a plate of the earth’s crust into the mantle beneath another plate.
  66. Subdue: To bring under control or conquer.
  67. Subfamily: A taxonomic category ranking between a family and a genus.
  68. Subfusc: Dull or gloomy in appearance.
  69. Subgenre: A subordinate genre within a particular genre.
  70. Subglacial: Existing or occurring beneath a glacier.
  71. Subhead: A heading given to a subsection of a piece of writing.
  72. Subitaneous: Suddenly appearing or produced.
  73. Subitize: To perceive the number of (a small group of items) at a glance and without counting.
  74. Subject: To cause or force to undergo (something unwelcome or unpleasant).
  75. Subjectivity: The quality of being based on or influenced by personal feelings, tastes, or opinions.
  76. Sublimate: To divert the energy of (a sexual or other biological impulse) into a culturally higher or socially more acceptable activity.
  77. Sublimation: The diversion of the energy of a biological or instinctual impulse into a socially higher or more acceptable activity.
  78. Sublunary: Belonging to this world as contrasted with a better or more spiritual one.
  79. Submachine: A firearm capable of firing continuously.
  80. Subman: A person regarded as being of a lesser social or occupational status.
  81. Submarine: A vessel that can be submerged and navigated underwater.
  82. Subprime: Denoting or relating to credit or loan arrangements for borrowers with a poor credit history.
  83. Subpanel: A secondary or additional panel.
  84. Subsidiary: Less important than but related or supplementary to something.
  85. Subdivide: Divide into smaller sections.

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