jam vs strawberry jam

jam and strawberry jam both are nouns.

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

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

Other hyponyms of jam include strawberry preserves.

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

jam (verb)	strawberry jam (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