trademark vs entryphone

trademark and entryphone both are nouns.

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

trademark (noun)	entryphone (noun)
a distinctive characteristic or attribute of someone or something	An intercom system which enables someone, without opening the door, to converse with the person who has rung the doorbell.
a formally registered symbol identifying the manufacturer or distributor of a product

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