-ster
/stə(r)/suffix
1
- denoting a person engaged in or associated with a particular activity or thing表示“做…的人”, “从事…的人”：
maltster
songster.
2
- denoting a person having a particular quality表示“处于…状态的人”, “有…品质的人”：
youngster.
词源
Old English -estre, -istre, etc., of Germanic origin.