Ethocaine vs Novocain

Ethocaine and Novocain both are nouns.

Word	Noun	Adjective	Verb	Adverb
Ethocaine	Yes	No	No	No
Novocain	Yes	No	No	No

As nouns, Novocain is a hyponym of Ethocaine; that is, Novocain is a word with a more specific, narrower meaning than Ethocaine:

Ethocaine: a white crystalline powder (trade name Ethocaine) administered near nerves as a local anesthetic in dentistry and medicine
Novocain: procaine administered as a hydrochloride (trade name Novocain)

Other hyponyms of Ethocaine include novocaine, procaine hydrochloride.

Ethocaine (noun)	Novocain (noun)
a white crystalline powder (trade name Ethocaine) administered near nerves as a local anesthetic in dentistry and medicine	procaine administered as a hydrochloride (trade name Novocain)