There are 2 ways to say Hair in Thai. The words are ผม pŏm and ขน kŏn.  Do you know what the difference is?

ผม pŏm

ผม is when you are talking about the hair on your head.

For example:

• hair cut
  ตัดผม
  dtàt pŏm
  
  
• Your hair is smooth
  ผมของคุณเรียบ
  pŏm kŏng kun rîap

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ขน kŏn

ขน is when you are talking about the hair NOT on your head. For example, the hair on your leg or the hair on your arm.
It is also what you call the hair / fur on animals.

For example:

• Feather
  ขนนก
  kŏn nók
  
  
• Fur
  ขน
  kŏn
  
  
• hair standing on edge, goosebumps
  ขนลุกซู่
  kŏn lúk sôo
  
  
• The hair on your arm
  ขนบนแขนคุณ
  kŏn bon kăen kun
  
  
• The dog’s fur is shiny
  ขนของหมามันวาว
  kŏn kŏng măa man waao

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I hope you now understand the differences between ผม pŏm and ขน kŏn.