Together:
* Interconnect: To connect two or more things together.
* Intertwine: To twist or weave together.
* Interlock: To connect or fasten together by interlocking parts.
* Intermingle: To mix or blend together.
* Interrelate: To have a mutual relationship or connection.
Between:
* Intercede: To act as a mediator between two parties.
* Interchange: To exchange or substitute one thing for another.
* Interfere: To intervene in a situation or matter.
* Interpose: To place or put something between two things.
* Intersperse: To scatter or place things at intervals between other things.
Both together and between:
* Interact: To act in a way that affects or is affected by others.
* Interdependent: Relying on each other for survival or success.
* Interface: A point where two systems, subjects, or organizations meet and interact.
* Internal: Situated or occurring within the body or a particular part of it.
These are just a few examples, and the specific meaning of each word will depend on the context in which it is used.