For physical objects:

* Combine: This is a general term for bringing two things together to form a single unit.

* Join: Similar to combine, but often implies a stronger connection.

* Merge: This suggests that the two things are becoming one, losing their individual identities.

* Concatenate: This is specific to joining strings of text or data.

* Connect: This implies that the two things are now linked together.

For concepts or ideas:

* Synthesize: This involves combining two or more things into a new and unified whole.

* Integrate: This implies bringing two things together in a way that they become an inseparable part of a larger system.

* Unite: This focuses on the act of bringing two things together, but doesn't necessarily imply a complete merging.

For other situations:

* Amalgamate: This is similar to merging, but implies a more formal or official process.

* Coalesce: This suggests that the two things are coming together naturally or spontaneously.

To give you the best answer, please tell me more about what you're trying to join!