1.
four
The number four. This reading (よん) is more commonly used in modern Japanese than し because し sounds like 死 (death). よん is generally preferred when counting and in most compound numbers.
Japanese has two readings for four: よん and し. よん is more common because し is homophonous with 死 (death), making it inauspicious. However, し is used in some set expressions like 四月 (shigatsu, April) and 四時 (yoji, four o'clock—note this is an exception using よ). When counting with つ, it becomes 四つ (yottsu).