Can anyone give me examples of a mass noun. So often on Countdown
Susie Dent disallows a word because it is a mass noun and I wondered what
the rules were?
In its simplest form, a mass noun is a singular noun which can't be pluralised even though it is used to refer to more than one (i.e. a mass) of individual items. To complicate things slightly, mass nouns take either a singular or plural verb depending on context.
And, for the record, Susie disallows mass nouns only if a contestant has attempted to pluralise them. E.g. 'cattle' would be perfectly acceptable, but 'cattles' wouldn't.
Mass nouns are allowed - it is their plurals that Susie disallows as these would be bad grammar. "Music" and "butter" are mass nouns, "musics" and "butters" would probably not be allowed in Countdown.
Butters most certainly should have been allowed. As has been suggested, a butter is "a fighter who strikes the opponent with the head", and therefore can easily be pluralised. Not only that, though - butter, as a regular verb, adds an 's' onto the infinitive to make the third person singular of the present tense, as in "He butters his bread very carefully".