Language Options -> Spell Checking in Windows 10 version 1803

Based upon your screenshot, you have a language pack installed and this appears to be the various options associated with Hebrew mode:

Specifies the script to use for checking spelling of Hebrew text.

The description of each option looks like this:

xlHebrewFullScript (default) The conventional script type as required by the Hebrew Language Academy when writing non-diacritisized text.

xlHebrewMixedAuthorizedScript The Hebrew traditional script.

xlHebrewMixedScript In this mode the speller accepts any word recognized as Hebrew, whether in Full Script, Partial Script, or any non-conventional spelling variation that is known to the speller.

xlHebrewPartialScript In this mode the speller accepts words both in Full Script and Partial Script. Some words will be flagged since this spelling is not authorized in either Full script or Partial script.

A legitimate Hebrew word can be a basic dictionary entry or any inflection.

Sources:
Administrative Templates (Users) - Hebrew mode
Microsoft Excel Visual Basic - HebrewModes Property
Excel VBA - SpellingOptions.HebrewModes Property