trademark vs Walkman

trademark and Walkman both are nouns.

Word	Noun	Adjective	Verb	Adverb
trademark	Yes	No	Yes	No
Walkman	Yes	No	No	No

trademark (noun)	Walkman (noun)
a distinctive characteristic or attribute of someone or something	(trademark) a pocket-sized stereo system with light weight earphones
a formally registered symbol identifying the manufacturer or distributor of a product

trademark (verb)	Walkman (verb)
register the trademark of
mark with a brand or trademark