Ethocaine vs novocaine

Ethocaine and novocaine both are nouns.

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

As nouns, novocaine is a hyponym of Ethocaine; that is, novocaine 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
novocaine: procaine administered as a hydrochloride (trade name Novocain)

Other hyponyms of Ethocaine include Novocain, procaine hydrochloride.

Ethocaine (noun)	novocaine (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)