General:
* Contribute: This is a general word for giving something, whether it be money, time, effort, or ideas.
* Donate: This word implies giving something to a charity or other good cause.
* Share: This suggests distributing something among a group, with everyone receiving a portion.
* Pool: This implies combining resources with others to achieve a common goal.
More specific:
* Collaborate: This implies working together with others to create something new.
* Cooperate: This means working together to achieve a common goal.
* Partner: This implies working together with others as equals.
* Co-author: This refers to writing something together with another person.
* Co-sign: This means agreeing to be responsible for a debt or obligation with another person.
Formal:
* Contribute to: This is a more formal way of saying "give."
* Donate to: This is a formal way of saying "give to a charity."
The best word to use depends on the specific situation.