weed killer vs silvex

weed killer and silvex both are nouns.

Word	Noun	Adjective	Verb	Adverb
weed killer	Yes	No	No	No
silvex	Yes	No	No	No

As nouns, silvex is a hyponym of weed killer; that is, silvex is a word with a more specific, narrower meaning than weed killer:

weed killer: a chemical agent that destroys plants or inhibits their growth
silvex: a herbicide that is effective in controlling woody plants but is toxic to animals

Other hyponyms of weed killer include Agent Orange, atrazine, linuron, paraquat, simazine, maleic hydrazide.

weed killer (noun)	silvex (noun)
a chemical agent that destroys plants or inhibits their growth	a herbicide that is effective in controlling woody plants but is toxic to animals