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be an early/late riser
early/late riser 表示习惯早起或晚起的人，riser 在这里指人，不是指动作。
He is an early riser and goes for a run every morning.
他是个早起的人，每天早上跑步。
起床者；早起的人
先理解核心含义，再看它在真实句子里的用法。
起床者；早起的人
a person who gets up, especially from bed
He is an early riser and goes for a run every morning.
他是个早起的人，每天早上跑步。
常与 early 或 late 连用，表示早起或晚起的人。
上升的人或物。
Someone or something which rises.
用于提升或抬高物体的平台或支架。
A platform or stand used to lift or elevate something.
楼梯台阶的竖板。
A vertical part of a step on a staircase.
弓的主体。
The main body of a bow.
My grandmother is an early riser, so she finishes her housework before breakfast.
我祖母习惯早起，所以她早饭前就做完了家务。
Are you a morning riser or a night owl?
你是习惯早起的人还是夜猫子？
Late risers often find it hard to arrange morning meetings.
晚起的人往往觉得安排早间会议很困难。
early/late riser 表示习惯早起或晚起的人，riser 在这里指人，不是指动作。
He is an early riser and goes for a run every morning.
他是个早起的人，每天早上跑步。
stair riser 指楼梯台阶的垂直面；水平面叫 tread。
The riser of each stair is 18 centimeters high.
每级楼梯的竖板高18厘米。
在建筑或管道工程中，riser 常指垂直的立管，日常口语中较少使用。
A riser in the building carries hot water to the upper floors.
大楼里的一根立管把热水送到上层。
Not this
He is early riser.
Use this
He is an early riser.
英语可数名词单数不能裸用；汉语没有冠词，学习者容易漏掉。early 以元音音素开头，所以用 an。an early riser 意思是“一个早起的人”。
Not this
He is an early riser in the morning.
Use this
He is an early riser.
early riser 本身已包含“早上起床”的意思，再加 in the morning 会造成语义重复。应删去多余的状语，保持表达简洁自然。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
早起的人
She has always been an early riser, even on weekends.
她一向是个早起的人，即使是周末也不例外。
晚起的人
He is a late riser, so he schedules his classes in the afternoon.
他是个晚起的人，所以把课安排在下午。
楼梯竖板
The stair risers were painted white to match the trim.
楼梯竖板刷成白色，以搭配装饰线条。
立管
The plumber checked the riser pipe on every floor of the building.
水管工检查了大楼每一层的立管。
早起的人
She's an early riser and goes for a run before work.
她是个早起的人，上班前会去跑步。
晚起的人
As a late riser, he often skips breakfast.
作为晚起的人，他经常不吃早餐。
我是奋起者，是从地面重新站起来的人；别赌我会倒下，我是奋起者。——迪尔克斯·本特利《Riser》
After losing his job, he proved to be a riser by starting his own company within a year.
失业后，他证明了自己是个奋起者，一年内就创办了自己的公司。
Use riser naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
rise（起）+ -er（者）：早起的人“rise”起床；楼梯竖板也是随台阶“上升”的垂直部分。
语域：neutral 常见场景：daily talk about sleep/wake routines、fixed phrases: early riser / late riser 表示“起床者”时，riser 多用于日常谈论作息习惯，尤其常见于 early riser、late riser 等固定搭配中，语气中性。
Genuine rhymes with riser /ˈraɪzə/ (stressed /aɪ/ + /zə/): visor, wiser, adviser, divisor, incisor, miser. Lookalikes that do NOT rhyme: rider /ˈraɪdə/, river /ˈrɪvə/, visitor /ˈvɪzɪtə/, user /ˈjuːzə/ — watch the consonant after the vowel.
Dictionary facts from ECDICT, WIKTIONARY.