There are several synonyms for the word "half-day" which can be used to describe a period of time that is approximately half of a full day. Some common synonyms include "morning half," "afternoon half," "4-hour block," "half work shift," "half-session," "shortened day," and "reduced hours." Each of these synonyms can be used in different settings depending on the context. For example, "morning half" may be used in a school setting to refer to the first half of the day, while "reduced hours" may be used in a work setting to refer to a shorter workday. Regardless of the situation, these synonyms can be used to accurately and effectively describe a half-day time period.