pellet vs duck shot

pellet and duck shot both are nouns.

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

As nouns, duck shot is a hyponym of pellet; that is, duck shot is a word with a more specific, narrower meaning than pellet:

Other hyponyms of pellet include BB, BB shot, bird shot, buckshot, grape, grapeshot, ball, musket ball.

pellet (noun)	duck shot (noun)
a solid missile discharged from a firearm	small lead shot for shotgun shells
a small rounded mass of a substance