scarecrow vs bird-scarer

scarecrow and bird-scarer both are nouns.

Word	Noun	Adjective	Verb	Adverb
scarecrow	Yes	No	No	No
bird-scarer	Yes	No	No	No

As nouns, scarecrow and bird-scarer are synonyms defined as:

scarecrow and bird-scarer: an effigy in the shape of a man to frighten birds away from seeds

Other synonyms of scarecrow include scarer, straw man, strawman.

scarecrow (noun)	bird-scarer (noun)
an effigy in the shape of a man to frighten birds away from seeds	an effigy in the shape of a man to frighten birds away from seeds