cirrhosis
diarrhoea (UK)
gonorrhoea (UK)
haemorrhage (UK)
haemorrhoid (UK)
pyrrhic
Note that in US English, words like "catarrh" and "myrrh" also belong to this group.
The Spelfabet shop has affordable, downloadable spelling teaching resources.
Spelfabet
Learning the building blocks of words - sounds, their spellings, and word parts
