Falco columbarius vs merlin

Falco columbarius and merlin both are nouns.

Word	Noun	Adjective	Verb	Adverb
Falco columbarius	Yes	No	No	No
merlin	Yes	No	No	No

As nouns, Falco columbarius and merlin are synonyms defined as:

Falco columbarius and merlin: small falcon of Europe and America having dark plumage with black-barred tail; used in falconry

Other synonyms of Falco columbarius include pigeon hawk.

Falco columbarius (noun)	merlin (noun)
small falcon of Europe and America having dark plumage with black-barred tail; used in falconry	small falcon of Europe and America having dark plumage with black-barred tail; used in falconry