Ah I see, is he learning 'eous' words- as that's how I used to teach them- put them in context into a sentence and the words off the list (ie in this case all the eous words) must be spelt correctly when the sentence is dictated for the children to write down.
This was one of the gaseous Mr Gove's educational reforms back in 2014, each year group were given a list of words which they had to be able to spell correctly by the end of that academic year. Y6's words were interesting to say the least and initially had a direct impact on the child's formal SAT writing assessment at the end of year as they had to be incorporated in writing and spelt without help ie independently. This was later changed- good thing too as many a child found writing spontaneously difficult if certain words had to be incorporated...