Ignore lists
Lookup in the ignore lists is smart: if the current word is in uppercase (first or mixed or all capitals), but the list includes the same word in lower case only, that is accepted. If the current word has a trailing period, but a word (upper or lower case, as above) is in the list without a period, that is accepted. The reverse is not true: "etc." in the list will not make "etc" accepted in the text.
Important: Ignore lists are not available in the Settings pane of