weedkiller vs atrazine

weedkiller and atrazine both are nouns.

Word	Noun	Adjective	Verb	Adverb
weedkiller	Yes	No	No	No
atrazine	Yes	No	No	No

As nouns, atrazine is a hyponym of weedkiller; that is, atrazine is a word with a more specific, narrower meaning than weedkiller:

weedkiller: a chemical agent that destroys plants or inhibits their growth
atrazine: a synthetic compound derived from triazine that is widely used as an agricultural herbicide

Other hyponyms of weedkiller include Agent Orange, linuron, paraquat, silvex, simazine, maleic hydrazide.

weedkiller (noun)	atrazine (noun)
a chemical agent that destroys plants or inhibits their growth	a synthetic compound derived from triazine that is widely used as an agricultural herbicide