jam vs dog's dinner

jam and dog's dinner both are nouns.

Word	Noun	Adjective	Verb	Adverb
jam	Yes	No	Yes	No
dog's dinner	Yes	No	No	No

As nouns, dog's dinner is a hyponym of jam; that is, dog's dinner is a word with a more specific, narrower meaning than jam:

Other hyponyms of jam include dog's breakfast.

jam (noun)	dog's dinner (noun)
deliberate radiation or reflection of electromagnetic energy for the purpose of disrupting enemy use of electronic devices or systems	a poor job; a mess
preserve of crushed fruit
a dense crowd of people
informal terms for a difficult situation

jam (verb)	dog's dinner (verb)
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