polyurethane foam vs PUR

polyurethane foam and PUR both are nouns.

Word	Noun	Adjective	Verb	Adverb
polyurethane foam	Yes	No	No	No
PUR	Yes	No	No	No

As nouns, PUR is a hypernym of polyurethane foam; that is, PUR is a word with a broader meaning than polyurethane foam:

polyurethane foam: a foam made by adding water to polyurethane plastics
PUR: any of various polymers containing the urethane radical; a wide variety of synthetic forms are made and used as adhesives or plastics or paints or rubber

Other hypernyms of polyurethane foam include polyurethan, polyurethane, PU.

polyurethane foam (noun)	PUR (noun)
a foam made by adding water to polyurethane plastics	any of various polymers containing the urethane radical; a wide variety of synthetic forms are made and used as adhesives or plastics or paints or rubber