The word "playing period" is commonly used in the context of sports to refer to the amount of time that a game is played. However, there are several other terms that can be used interchangeably with this phrase. Some possible synonyms might include "match duration", "game time", "contest length" or "play duration". Each of these alternative terms essentially refers to the same concept of how long a game or match lasts for, but may be preferred in different contexts or by different sports enthusiasts. Other potential synonyms might include "time frame" or "play time", which could also be used to describe the duration of a particular sporting event.