duck shot vs bird shot

duck shot and bird shot both are nouns.

Word	Noun	Adjective	Verb	Adverb
duck shot	Yes	No	No	No
bird shot	Yes	No	No	No

As nouns, duck shot and bird shot are synonyms defined as:

Other synonyms of duck shot include buckshot.

duck shot (noun)	bird shot (noun)
small lead shot for shotgun shells	small lead shot for shotgun shells