Here are some possibilities, depending on the context:
For physical openings:
* -ture: This is a common suffix used for openings, especially when referring to an opening that allows something to pass through. Examples: aperture, puncture, fissure.
* -ing: This can be used for an opening that is in progress or that is ongoing. Examples: opening (as in "the opening of the door"), opening (as in "the store is opening").
* -ment: This can be used for an opening that is a result of an action. Example: "The tunnel's new opening is located further south."
For more abstract openings:
* -ing: This is often used to describe the act of opening something, whether physical or metaphorical. Examples: opening (as in "the opening of the presentation"), opening (as in "the opening of the new school year").
* -ment: This is also a good option for abstract openings, especially when referring to a result or product of an action. Example: "The opening of the new restaurant was a huge success."
* -ation: This can be used for a formal or official opening. Examples: inauguration, initiation, activation.
For specific types of openings:
* -port: This is used for openings that allow for access or passage. Examples: airport, seaport.
* -way: This is used for openings that allow for movement. Examples: doorway, gateway.
The best suffix for you will depend on the specific meaning of "opening" you are trying to convey.