General synonyms:
* Haven: This emphasizes the sense of safety and refuge that an oasis provides.
* Sanctuary: Similar to haven, it implies a protected and peaceful place.
* Paradise: This emphasizes the beauty and abundance of an oasis.
* Retreat: This highlights the idea of escaping from a harsh environment.
* Waterhole: This is a more literal term for a source of water in a desert.
More specific synonyms:
* Green spot: This is a more general term for a patch of vegetation in a desert.
* Springs: This refers specifically to the water source of an oasis.
* Palm grove: This describes the specific vegetation often found in oases.
* Emerald jewel: This is a metaphorical term that emphasizes the beauty and rarity of an oasis.
The best synonym to use depends on the specific meaning you want to convey.