This is the 1693rd most frequent Chinese word.
付
"付" means "to pay" or "to hand over."
付 refers to 'to pay,' and is followed by the object being paid for.
我已经付了午餐的钱。
I have already paid the money for lunch.
付出 expresses 'to devote or spend,' often referring to effort or time.
这份工作需要付出大量的努力。
This work requires devoting a lot of effort.
付出 in this context means 'to pay or expend,' often related to intangible losses or sacrifices.