difference between spot and stain

spot - (хир толбо, арилгахад амархан толбо) A "spot" is generally small (often circular) and localized. A "stain" can be much larger and irregularly shaped. But you could probably use them interchangeably in most cases. spot is usually darker in color,  These usually are removed during the cleaning process.
1) a small round area that has a different color or feels different from the surface it is on
      ---- The male bird has a red spot on its beak.
2) a small dirty mark on something
      ----  His jacket was covered with spots of mud.
3) a particular area or place
      ---- He showed me the exact spot where he had asked her to marry him.
stain - (сэв толбо, арилгахад хэцүү толбо)A "spot" is generally small (often circular) and localized. A "stain" can be much larger and irregularly shaped. But you could probably use them interchangeably in most cases. Stains sometimes can be removed with specialty effort, but not by the regular cleaning process.
1) [countable] a dirty mark on something, that is difficult to remove
        ---- a blood/a coffee/an ink, etc. stain
        --- How can I get this stain out?

IS THERE A DIFFERENCE BETWEEN A SPOT AND STAIN?

• A "spot" is generally small (often circular) and localized. A "stain" can be much larger and irregularly shaped. But you could probably use them interchangeably in most cases.

• A spot is a substance from a spill that is added to your carpet, usually darker in color than the carpet.  These usually are removed during the cleaning process.
  A stain is a substance from a spill that either adds or removes color from you carpet. Stains sometimes can be removed with specialty spot removers, but not by the regular cleaning process.

• Spots are created by something being dropped or spilt on the carpet. The substance does not have the ability to permanently bond to the fiber or cause damage to the fiber. Proper cleaning steps can completely remove the substance from the carpet.
  Stains are created by something being dropped or spilt on a carpet, but the substance has the ability to permanently damage the carpet fiber. The substance permanently adds color to the carpet or the substance removes color from the carpet.