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Most without an article is usually used as an adjective, which means almost all or the largest part.

For example:-

  • Most days I go for a jog.
  • They ate most of the cake.

It's also used to form the superlative where it goes in front of most adverbs.

For example:-

  • He objected to the results of the election most strongly.

Mostly is an adverb. It's not used very often. It means generally, mainly, chiefly, usually etc.

For example:-

  • They're mostly good people, although they have made a few mistakes.
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