second vs back up

back up vs second

second is a noun but back up is not a noun.

second is an adjective but back up is not an adjective.

second and back up both are verbs.

second is an adverb but back up is not an adverb.

Word	Noun	Adjective	Verb	Adverb
second	Yes	Yes	Yes	Yes
back up	No	No	Yes	No

As verbs, back up is a hypernym of second; that is, back up is a word with a broader meaning than second:

second: give support or one's approval to
back up: give moral or psychological support, aid, or courage to

Other hypernyms of second include support.

second (noun)	back up (noun)
the fielding position of the player on a baseball team who is stationed near the second of the bases in the infield
the gear that has the second lowest forward gear ratio in the gear box of a motor vehicle
merchandise that has imperfections; usually sold at a reduced price without the brand name
a speech seconding a motion
the official attendant of a contestant in a duel or boxing match
a 60th part of a minute of arc
following the first in an ordering or series
1/60 of a minute; the basic unit of time adopted under the Systeme International d'Unites
an indefinitely short time
a particular point in time

second (adjective)	back up (adjective)
a part or voice or instrument or orchestra section lower in pitch than or subordinate to the first
coming next after the first in position in space or time or degree or magnitude

second (verb)	back up (verb)
give support or one's approval to	establish as valid or genuine
transfer an employee to a different, temporary assignment	become or cause to become obstructed
	make a copy of (a computer file) especially for storage in another place as a security copy
	move backwards from a certain position
	give moral or psychological support, aid, or courage to

second (adverb)	back up (adverb)
in the second place

Difference between second and back up

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