Formal:
* Saliva: This is the most clinical and scientific term.
* Expectorate: This is a formal, often medical, term for expelling saliva or mucus.
* Eject: This is a more general term for forcing something out, but can be used for spitting.
Informal:
* Drool: This implies a more passive, involuntary release of saliva.
* Slobber: This is a more informal and somewhat derogatory term for excessive drooling.
* Spittle: This is a more archaic and poetic term for spit.
* Cusp: This is a slang term for spitting, often used in the context of spitting tobacco.
* Hock: Another slang term, typically used in the context of spitting phlegm.
* Spit out: This emphasizes the act of expelling something from the mouth.
Figurative:
* Emit: This can be used figuratively to describe something that is released or expelled.
* Discharge: This can be used to describe the expulsion of something, often in a forceful manner.
The best word to use will depend on the specific context and the desired level of formality.