I'm struggling with this exercise that I found in a German grammar book: I have to combine some nouns with the correct suffix to form their plural
- der Schnee
- das Gepäck
- der Regen
- der Rat
- der Käse
- der Sport
- der Schmuck
- das Alter
The first one is given as an example: "der Schnee" -> "die Scheemassen".
I haven't got a clue about the other ones (apart from "der Regen" which I think should be "die Regenfälle"). I looked up the nouns in various online dictionaries but I couldn't find these "strange" plural forms (usually the ones given are much more simple, like: -e/-en).
I guess that most of these forms are quite uncommon in both spoken and written German, is that true? Could someone please help me complete the exercise?