er做后缀的单词有：
washer n.洗衣机；
lighter n 打火机；
heater n 加热器；
boiler n 锅炉；
mutter v 喃喃自语；
chatter v 喋喋不休；
stutter v 口吃；
waver v 摆动；
batter v 连打，不断打。
例句：
The singer was discovered while still at school.
这个歌唱家在上学的时候就受到赏识了。
The star of the show was a young Italian singer.
那台节目的主角是一位年轻的意大利歌唱家。
The singer gave a dismal performance of some old songs.
那歌手唱了几首老歌，唱得不怎么样。
He won't cut it as a professional singer.
他的歌艺未达到专业歌手水平。
The singer worked hard on the clear articulation of every note.
歌手苦练以便每一个音都唱得清晰。