What is the synonym of word alternate?

Here are some synonyms for "alternate," depending on the specific context:

For "to switch between two things":

* Rotate

* Cycle

* Change

* Vary

* Substitute

For "every other":

* Every second

* Second

* Other

* Intermittent

For "alternative":

* Alternative

* Other

* Different

* Subsidiary

* Replacement

For "to change something regularly":

* Replace

* Substitute

* Exchange

* Swap

The best synonym will depend on the specific context of your sentence.