dot com vs dot com company

dot com and dot com company both are nouns.

Word	Noun	Adjective	Verb	Adverb
dot com	Yes	No	No	No
dot com company	Yes	No	No	No

As nouns, dot com and dot com company are synonyms defined as:

dot com and dot com company: a company that operates its business primarily on the internet using a URL that ends in `.com'

Other synonyms of dot com include dot-com.

dot com (noun)	dot com company (noun)
a company that operates its business primarily on the internet using a URL that ends in `.com'	a company that operates its business primarily on the internet using a URL that ends in `.com'