malfunction vs jam

malfunction and jam both are nouns.

Word	Noun	Adjective	Verb	Adverb
malfunction	Yes	No	Yes	No
jam	Yes	No	Yes	No

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

Other hyponyms of malfunction include brick, glitch.

malfunction (noun)	jam (noun)
a failure to function normally	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

malfunction (verb)	jam (verb)
fail to function or function improperly	interfere with or prevent the reception of signals
	crowd or pack to capacity
	get stuck and immobilized
	block passage through
	crush or bruise
	press tightly together or cram
	push down forcibly