The word 'relief' is uncountable, but it is also possible to use it as a countable noun. You may hear the expression "Oh what a relief!"

　　In this case, it is only used in the singular form: there is no plural version of it.

　　Here 'relief' refers to a feeling of comfort when something frightening or worrying is about to happen but then doesn't. Perhaps you thought you had a serious illness but then found out you didn't - what a relief!

　　The same thing happens with the normally uncountable nouns 'pity' and 'shame'.

　　What a pity!

　　What a shame!

　　Listen and find out more about the word 'relief'.