mud hen vs American coot

mud hen and American coot both are nouns.

Word	Noun	Adjective	Verb	Adverb
mud hen	Yes	No	No	No
American coot	Yes	No	No	No

As nouns, mud hen and American coot are synonyms defined as:

Other synonyms of mud hen include Fulica americana, marsh hen, water hen.

mud hen (noun)	American coot (noun)
a coot found in North America	a coot found in North America