quag vs morass

quag and morass both are nouns.

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

As nouns, quag and morass are synonyms defined as:

Other synonyms of quag include mire, quagmire, slack.

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