tetraethyl lead vs lead tetraethyl

tetraethyl lead and lead tetraethyl both are nouns.

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

As nouns, tetraethyl lead and lead tetraethyl are synonyms defined as:

tetraethyl lead and lead tetraethyl: a clear oily poisonous liquid added to gasoline to prevent knocking

tetraethyl lead (noun)	lead tetraethyl (noun)
a clear oily poisonous liquid added to gasoline to prevent knocking	a clear oily poisonous liquid added to gasoline to prevent knocking