morass vs quag

morass and quag both are nouns.

Word	Noun	Adjective	Verb	Adverb
morass	Yes	No	No	No
quag	Yes	No	No	No

As nouns, morass and quag are synonyms defined as:

Other synonyms of morass include mire, quagmire, slack.

morass (noun)	quag (noun)
a soft wet area of low-lying land that sinks underfoot	a soft wet area of low-lying land that sinks underfoot