soon：副词

1，in a short time from now; a short time after sth else has happened

eg:We’ll be home soon. / We’ll soon be home.

She sold the house soon after her husband died.

2,early; quickly

eg:How soon can you get here?

We’ll deliver the goods as soon as possible.

The sooner we set off, the sooner we will arrive.

固定用法：

no sooner said than done：说到做到

used to say that sth was, or will be, done immediately

no sooner … than …：一……就……

used to say that sth happens immediately after sth else

eg:No sooner had she said it than she burst into tears.

the sooner the better：越快越好

sooner or later迟早

quick:形容词，副词，名词

adj.快的, 迅速的, 敏捷的, 急剧的, 活泼的

eg: a quick mind 敏捷的头脑

a quick temper 急性子

a quick rise through the ranks 官职升得很快

quick to find fault 很快就找出错误

adv.快

eg: quickly 快速的

n.活人，生物, 要点, 本质, 核心, 感觉敏锐的部位

eg: the quick and the dead 生者与死者

get to the quick of the matter 进入议题的核心

综上所述，soon和quick 不论是词性还是意义解释都相差甚远