Crex crex vs land rail

Crex crex and land rail both are nouns.

Word	Noun	Adjective	Verb	Adverb
Crex crex	Yes	No	No	No
land rail	Yes	No	No	No

As nouns, Crex crex and land rail are synonyms defined as:

Crex crex and land rail: common Eurasian rail that frequents grain fields

Other synonyms of Crex crex include corncrake.

Crex crex (noun)	land rail (noun)
common Eurasian rail that frequents grain fields	common Eurasian rail that frequents grain fields