long-billed marsh wren vs Cistothorus palustris

long-billed marsh wren and Cistothorus palustris both are nouns.

Word	Noun	Adjective	Verb	Adverb
long-billed marsh wren	Yes	No	No	No
Cistothorus palustris	Yes	No	No	No

As nouns, long-billed marsh wren and Cistothorus palustris are synonyms defined as:

long-billed marsh wren and Cistothorus palustris: American wren that inhabits tall reed beds

long-billed marsh wren (noun)	Cistothorus palustris (noun)
American wren that inhabits tall reed beds	American wren that inhabits tall reed beds