tetraethyl lead vs antiknock

tetraethyl lead and antiknock both are nouns.

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

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

tetraethyl lead: 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

tetraethyl lead (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

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