Time:
* Era: A long and distinct period of time, typically marked by significant events or changes.
* Epoch: A particular period of time in history or a person's life.
* Age: A particular stage of life or history.
* Span: A length of time.
* Duration: The length of time that something lasts.
* Phase: A stage in a process or development.
* Interval: A space of time between two events.
* Season: A specific time of year.
* Term: A fixed or limited period of time.
Punctuation:
* Full stop: The punctuation mark used to end a sentence.
* Full point: Another term for a full stop.
Other:
* Cycle: A complete sequence of events that repeats regularly.
* Stage: A particular point in a process or development.
* Chapter: A distinct section of a book or a series of events.
* Stint: A period of time spent doing a particular job or activity.
To give you the best synonyms, please provide more context about how you are using the word "period."