lead tetraethyl vs antiknock

lead tetraethyl and antiknock both are nouns.

Word	Noun	Adjective	Verb	Adverb
lead tetraethyl	Yes	No	No	No
antiknock	Yes	Yes	No	No

As nouns, antiknock is a hypernym of lead tetraethyl; that is, antiknock is a word with a broader meaning than lead tetraethyl:

lead tetraethyl: a clear oily poisonous liquid added to gasoline to prevent knocking
antiknock: any of various compounds that are added to gasoline to reduce engine knocking

lead tetraethyl (noun)	antiknock (noun)
a clear oily poisonous liquid added to gasoline to prevent knocking	any of various compounds that are added to gasoline to reduce engine knocking

lead tetraethyl (adjective)	antiknock (adjective)
	suppressing or eliminating engine knock in combustion engines