"artefact vs artifact"
"echoes vs echos"
"-cele vs -coele"
"fetus vs foetus"
"sulfur vs sulphur"
"x-ray (not xray or x ray or X ray or Xray)"
"only 'X-ray' when following standard capitalisation rules e.g. at the start of a sentence, when in a reference or forming part of a proper noun"
"grey vs gray"
"heterogeneous vs heterogenous"
Expected headings
"Specific words"
"Prefixes"
"Correct spelling, also known as orthography in formal usage, is crucial to ensuring that the site is easy to read and trusted. There are a number of troublesome examples that are either frequently written incorrectly, misunderstood or where multiple forms are accepted. In the latter case, we just need to choose one form for the sake of uniformity. The term orthography, is the formal term for the system of spelling for any language, although it also encompasses punctuation."
"Correct spelling, also known as orthography in formal usage, is crucial to ensuring that the site is easy to read and trusted. There are a number of troublesome examples that are either frequently written incorrectly, misunderstood or where multiple forms are accepted. In the latter case, we just need to choose one form for the sake of uniformity. The term orthography, is the formal term for the system of spelling for any language, although it also encompasses punctuation."