As a verb:
* Look at the beautiful sunset. (Meaning: direct your eyes towards)
* She looked up from her book. (Meaning: move your eyes upward)
* He looks tired today. (Meaning: appear to be)
* Look before you leap. (Meaning: consider carefully before acting)
* They are looking for a new apartment. (Meaning: searching)
As a noun:
* Take a good look around the museum. (Meaning: an act of looking)
* She gave me a surprised look. (Meaning: an expression on the face)
As an adjective:
* She wore a look of determination. (Meaning: appearing to have a certain quality)
As an interjection:
* Look! There's a bird on the window sill. (Meaning: attracting attention)
The meaning of "look" depends on the context and the other words around it. It's a versatile word that can be used in many ways!