The joiners. Two of them are single letters glued to the next word.

• وَ
  and; by (oath); while

  wa

  conjunction · 9594×
• فَ
  so, then, and so

  fa

  conjunction · 3001×
• ثُمَّ
  then, thereafter

  thumma

  conjunction · 338×
• أَوْ
  or

  aw

  conjunction · 280×
• أَمْ
  or (in questions)

  am

  conjunction · 137×
• بَلْ
  rather, but instead, nay

  bal

  conjunction · 127×
• لَٰكِنْ
  but, however

  lakin

  conjunction · 73×