railroad tie vs railroad

railroad tie and railroad both are nouns.

Word	Noun	Adjective	Verb	Adverb
railroad tie	Yes	No	No	No
railroad	Yes	No	Yes	No

railroad tie (noun)	railroad (noun)
one of the cross braces that support the rails on a railway track	line that is the commercial organization responsible for operating a system of transportation for trains that pull passengers or freight
	a line of track providing a runway for wheels

railroad tie (verb)	railroad (verb)
	transport by railroad
	supply with railroad lines
	compel by coercion, threats, or crude means