chloride of lime vs whitener

chloride of lime and whitener both are nouns.

Word	Noun	Adjective	Verb	Adverb
chloride of lime	Yes	No	No	No
whitener	Yes	No	No	No

As nouns, whitener is a hypernym of chloride of lime; that is, whitener is a word with a broader meaning than chloride of lime:

chloride of lime: a white powder comprised of calcium hydroxide and chloride and hypochlorite and used to bleach and/or disinfect
whitener: an agent that makes things white or colorless

Other hypernyms of chloride of lime include blanching agent, bleach, bleaching agent.

chloride of lime (noun)	whitener (noun)
a white powder comprised of calcium hydroxide and chloride and hypochlorite and used to bleach and/or disinfect	an agent that makes things white or colorless