sparrow hawk vs kestrel

sparrow hawk and kestrel both are nouns.

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

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

Other synonyms of sparrow hawk include American kestrel, Falco sparverius.

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