答：它们的词性、用法不同。hard-working为形容词勤劳的，而hardworking形容词为努力工作，同时也是 hardwork的现在分词形式

hard-working

为形容词 勤勉的；勤奋的；勤劳的，常用在在名词后。

例句有：He is honest, sober and hard-working. 他诚实、稳重、勤奋。

We are looking for someone who is reliable and hard-working.

我们在物色可靠而又勤奋的人。

I remember her as a quiet, hard-working and well-spoken girl.

我记得她是个安静、勤奋且谈吐优雅的女孩子。

同义词有：diligent , industrious 勤勉的

短语有：

hard working 工作勤奋 ;hard working people 工作狂 ; be hard-working 勤奋的

a hard-working person 一个勤奋的人 ；clever hard-working 聪明勤奋

Hard working with disease 劳苦与疾病；the hard working people 辛勤工作的人

hardworking

1.形容词意思是：努力工作的；不辞辛劳的，苦干的

例句有：I like your down-to-earth and hardworking spirit.

我就喜欢你们这股扎扎实实埋头苦干的劲儿。

She is a good girl and will make a hardworking and devoted wife.

她是一个好女孩，将来会成为一个勤劳忠贞的妻子。

2、动词的意思是努力工作为hardwork的现在分词形式，常用作主语或宾语

Hardworking, energetic, charming. 勤奋，精力充沛，有魅力。

Family value, hardworking, and education. 家庭、勤奋和教育。

短语有：We are hardworking 勤奋 ;

the hardworking and enterprising spirit 艰苦创业的精神 ;

a hardworking people 勤劳的民族

Hardworking with carefulness 工作细致认真