railway line vs underground

underground vs railway line

railway line and underground both are nouns.

railway line is not an adjective while underground is an adjective.

railway line is not an adverb while underground is an adverb.

Word	Noun	Adjective	Verb	Adverb
railway line	Yes	No	No	No
underground	Yes	Yes	No	Yes

As nouns, underground is a hyponym of railway line; that is, underground is a word with a more specific, narrower meaning than railway line:

railway line: line that is the commercial organization responsible for operating a system of transportation for trains that pull passengers or freight
underground: an electric railway operating below the surface of the ground (usually in a city)

Other hyponyms of railway line include cable railway, funicular, funicular railway, cog railway, rack railway, el, elevated, elevated railroad, elevated railway, overhead railway, metro, subway, subway system, tube, monorail, rail, scenic railway.

railway line (noun)	underground (noun)
the road consisting of railroad track and roadbed	an electric railway operating below the surface of the ground (usually in a city)
line that is the commercial organization responsible for operating a system of transportation for trains that pull passengers or freight	a secret group organized to overthrow a government or occupation force

railway line (adjective)	underground (adjective)
	conducted with or marked by hidden aims or methods
	under the level of the ground

railway line (adverb)	underground (adverb)
	beneath the surface of the earth
	in or into hiding or secret operation

Difference between railway line and underground

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