bird shot vs buckshot

bird shot and buckshot both are nouns.

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

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

Other synonyms of bird shot include duck shot.

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