Boggiest vs Foggiest - What's the difference?

As adjectives the difference between boggiest and foggiest

is that boggiest is (boggy) most boggy while foggiest is (foggy).

(head)

(boggy) most boggy.

(er)

Having the qualities of a bog ; i.e. dank, squishy, muddy, and full of water and rotting vegetation.

The edge of the woods led out onto a noisome, boggy fen, a paradise for mosquitos and small frogs.

* (having the qualities of a bog) marshy, swampy

(head)

(foggy)

Moscow is the foggiest city I've ever been to.

(usually, used in the negative) Very unclear; only slightly known; very difficult to understand or begin.

I don't have the foggiest idea how to get to Piccadilly Circus on the Tube.

She wasn't going to get the foggiest notion about modern writing from those old books.

He asked me where she was going and I said "I don't have the foggiest ."