Part-time and Per diem

Part-time adjective - Involving less than the standard or customary time for an activity.

Per diem and part-time are semantically related. In some cases you can use "Per diem" instead an adjective phrase "Part-time".

Per diem noun - A daily allowance for living expenses (especially while traveling in connection with your job).

Part-time and per diem are semantically related. Sometimes you can use "Part-time" instead an adjective phrase "Per diem".