This KS2 English spelling quiz will test you on phonemes. A phoneme is a single language sound. The word 'cat' has three phonemes - 'c', 'a', and 't'. A grapheme is a letter or combination of letters which spells a phoneme. The 'c' sound heard in 'cat' can also be made by the grapheme 'k' as in 'kettle' or the 'ck' of 'brick'. Learning phonics can help you with your spelling.
You may want to play the quiz on graphemes along with this quiz to give you a full understanding of the differences.
See how well you know the English language and its phonemes by trying this quiz.