morass vs quagmire

morass and quagmire both are nouns.

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

As nouns, morass and quagmire are synonyms defined as:

morass and quagmire: a soft wet area of low-lying land that sinks underfoot

Other synonyms of morass include mire, quag, slack.

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