The Czech words nahoru and na horu are both adverbs that mean "upward" or "upwards".

• Nahoru is a more general adverb that can be used in any context to mean "upward". For example, you could say "Jdu nahoru" (I’m going upstairs) or "Vítr fouká nahoru" (The wind is blowing upwards).
• Na horu is more specifically used to mean "up a mountain". For example, you could say "Vystoupali jsme na horu" (We climbed up the mountain) or "Chystáme se na výlet na horu" (We’re going on a mountain trip).

In some cases, the two words can be used interchangeably. For example, you could say "Letadlo letělo nahoru" (The plane flew upwards) or "Letadlo letělo na horu" (The plane flew up the mountain). However, in general, nahoru is a more general adverb, while na horu is specifically used to mean "up a mountain".

Here is a table summarizing the difference between the two words:

Word	Meaning	Connotation
Nahoru	Upward, upwards	General
Na horu	Up a mountain	Specific

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