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Cassette
From WikiPedalia
A cluster of sprockets and spacers designed for use on a freehub. Some of the sprockets and spacers may be semi-permanently attached to one another by bolts or rivets. See my article on Shimano Cassettes
Poorly-informed cyclists often misuse this term when they're actually speaking of a multiple freewheel , not a cassette. I have a special article that explains the difference between cassettes and multiple freewheels.
If you're speaking generically about multiple rear sprocket sets, or in other situations where you don't know which type is on a particular bike, the safest generic term is "cluster" which can apply equally to freewheels and cassettes.
