jam vs back up

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

jam and back up both are verbs.

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

As verbs, back up is a hyponym of jam; that is, back up is a word with a more specific, narrower meaning than jam:

jam: block passage through
back up: become or cause to become obstructed

Other hyponyms of jam include block off, blockade, barricade, barricado, barricade, asphyxiate, choke, stifle, suffocate, tie up, dam, dam up, block out, screen, earth up, land up, bar, barricade, block, block off, block up, blockade, stop, choke, choke off, clog, clog up, congest, crap up, foul.

jam (noun)	back up (noun)
deliberate radiation or reflection of electromagnetic energy for the purpose of disrupting enemy use of electronic devices or systems
preserve of crushed fruit
a dense crowd of people
informal terms for a difficult situation

jam (verb)	back up (verb)
interfere with or prevent the reception of signals	establish as valid or genuine
crowd or pack to capacity	become or cause to become obstructed
get stuck and immobilized	make a copy of (a computer file) especially for storage in another place as a security copy
block passage through	move backwards from a certain position
crush or bruise	give moral or psychological support, aid, or courage to
press tightly together or cram
push down forcibly

Difference between jam and back up

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