machine vs tunnel

machine and tunnel both are nouns.

Word	Noun	Adjective	Verb	Adverb
machine	Yes	No	Yes	No
tunnel	Yes	No	Yes	No

machine (noun)	tunnel (noun)
any mechanical or electrical device that transmits or modifies energy to perform or assist in the performance of human tasks	a passageway through or under something, usually underground (especially one for trains or cars)
a motor vehicle with four wheels; usually propelled by an internal combustion engine	a hole made by an animal, usually for shelter
a device for overcoming resistance at one point by applying force at some other point
a group that controls the activities of a political party
an intricate organization that accomplishes its goals efficiently
an efficient person

machine (verb)	tunnel (verb)
make by machinery	force a way through
turn, shape, mold, or otherwise finish by machinery	move through by or as by digging