kestrel vs sparrow hawk

kestrel and sparrow hawk both are nouns.

Word	Noun	Adjective	Verb	Adverb
kestrel	Yes	No	No	No
sparrow hawk	Yes	No	No	No

As nouns, kestrel and sparrow hawk are synonyms defined as:

Other synonyms of kestrel include American kestrel, Falco sparverius.

kestrel (noun)	sparrow hawk (noun)
small Old World falcon that hovers in the air against a wind	small North American falcon
small North American falcon	small hawk of Eurasia and northern Africa