평일(pyeong-il, pyeongil)
Refers to weekdays, Monday through Friday, typically work or school days.
When to use
Workdays, School days, Weekday work, Weekday events
The nuance
Use 평일 for official workdays or school days from Monday to Friday, excluding holidays or special days.
주말(ju-mal, jumal)
Refers to the weekend, Saturday and Sunday, days for rest or leisure outside the workweek.
When to use
Rest time, Leisure activities, Weekend trips, Weekend gatherings
The nuance
Use 주말 for non-working days typically used for rest or leisure, specifically Saturday and Sunday, not overlapping weekdays.