jam vs point jam

jam is a noun but point jam is not a noun.

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

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

Other hyponyms of jam include barrage jam, spot jam, blanket jam.

jam (noun)	point jam (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)	point jam (verb)
interfere with or prevent the reception of signals	jam a narrow band of frequencies
crowd or pack to capacity
get stuck and immobilized
block passage through
crush or bruise
press tightly together or cram
push down forcibly