Here are some examples:
* "We went on a long hike in the mountains." (The noun "hike" refers to the activity itself.)
* "The trail was a challenging hike for beginners." (Again, "hike" refers to the activity.)
* "We took a short hike to the waterfall." (Same thing, "hike" refers to the activity.)
However, "hike" can also be a verb.
For example:
* "Let's hike to the top of the hill." (The verb "hike" describes the action of walking.)
So, it depends on how the word is used in the sentence.