равноценны ли слова

[снежинка]

есть два слова foggy и  misty, равноценны ли они( т.е они значат одно и тоже?) помогите разобраться. Спасибо заранее.

[Arz]

Mist or fog?...   

But what is the difference between mist and fog? The answer lies in their thickness – and how far we can see through them (ie: the visibility). If we can see less than 1 km through the cloud of water droplets, it is known as fog. If we can see between 1 and 2 km, we call it mist.