Falco columbarius vs pigeon hawk

Falco columbarius and pigeon hawk both are nouns.

Word	Noun	Adjective	Verb	Adverb
Falco columbarius	Yes	No	No	No
pigeon hawk	Yes	No	No	No

As nouns, Falco columbarius and pigeon hawk are synonyms defined as:

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

Other synonyms of Falco columbarius include merlin.

Falco columbarius (noun)	pigeon hawk (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