‘Ise’ / ‘Ize’ Words
The options for ‘ize’ / ‘ise’ and ‘yze’ / ‘yse’ are part of the Spelling Variations check.
By default, PerfectIt only checks for inconsistent spelling of individual words. Thus, if ‘organization’ is also spelled as ‘organisation’ (or even ‘organisational’) within a document, PerfectIt will flag that as a possible consistency mistake.
However, the ‘ize’ / ‘ise’ and ‘yze’ / ‘yse’ options allow you to set preferences for all words. To prefer ‘ize’, for example, simply click that row in the Style Sheet Editor, choose Prefer Z from the dropdown menu and click Insert.
If you save that preference, PerfectIt will find all instances of ‘realise’, ‘organisation’, etc. and suggest ‘realize’, ‘organization’, etc.
See also