* Noun: This is the most common usage. An oasis is a place in a desert where there is water and vegetation.
* Example: "They found an oasis after days of searching."
* Adjective: It can describe something as being like an oasis, a place of peace and refuge.
* Example: "The library was an oasis of quiet in the bustling city."
* Verb: While less common, "oasis" can be used as a verb meaning "to provide relief or comfort," similar to "to refresh."
* Example: "The music oasised his weary soul."
Therefore, the part of speech for "oasis" depends on the context of the sentence.