weedkiller vs chemical

weedkiller and chemical both are nouns.

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

As nouns, chemical is a hypernym of weedkiller; that is, chemical is a word with a broader meaning than weedkiller:

weedkiller: a chemical agent that destroys plants or inhibits their growth
chemical: material produced by or used in a reaction involving changes in atoms or molecules

Other hypernyms of weedkiller include chemical substance.

weedkiller (noun)	chemical (noun)
a chemical agent that destroys plants or inhibits their growth	material produced by or used in a reaction involving changes in atoms or molecules

weedkiller (adjective)	chemical (adjective)
	relating to or used in chemistry
	of or made from or using substances produced by or used in reactions involving atomic or molecular changes