noun
absentee; person absent from work
Refers to a person who is absent from work or duty, often without permission or habitually.
今日は欠勤者が多くて、仕事がなかなか進まなかった。
There were many absentees today, so work didn't progress much.
欠席者 is a more general term for an absentee from any meeting or class, while 欠勤者 specifically refers to absence from work.
Compound of 欠勤 (absence from work) and 者 (person).