buckshot vs bird shot

buckshot and bird shot both are nouns.

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

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

Other synonyms of buckshot include duck shot.

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