B2C you introduced the notion of meeting WP COMMONALITY as a matter of degree I though have taken is as a mere hurdle requirement In this case both spellings plainly meet that requirement so it is reasonable to move on to other considerations Here there are two consistency within the article and consistency between similar articles a desideratum according to policy at WP TITLE The article is written in British English for example with goitre not goiter so a spelling that tends the British way gives internal consistency Do you find that other titles include semantically related forms beginning with iodiz or iodis I don t I therefore think there is no problem with consistency between articles either As for the definition and individuation of words being a semantic matter I agree Of course Much that is important in RMs and in the proper reading of guidelines and policies is inevitably semantic That is simply to say that we have to attend to meanings Surprised by that Alarmed Now WP COMMONALITY refers to variant spellings It does not refer to distinct words that are exactly similar except in that they differ in spelling along with differences that are minimally and necessarily consequent on that primary difference So the guideline is naturally to be interpreted in the way I show above Noetica