marshy vs boggy

marshy and boggy both are adjectives.

Word	Noun	Adjective	Verb	Adverb
marshy	No	Yes	No	No
boggy	No	Yes	No	No

As adjectives, marshy and boggy are synonyms defined as:

Other synonyms of marshy include miry, mucky, muddy, quaggy, sloppy, sloughy, soggy, squashy, swampy, waterlogged.

marshy (adjective)	boggy (adjective)
(of soil) soft and watery	(of soil) soft and watery