LocalDictionary spelling adding words

Sorry if topic is not exact. I write Ainu in various Roman Latin scripts on English GUI Catalina ,Text Edit. The Ainu words are similar to English ex. 'an' in Ainu is 'exist' ,Ainu Language exists 'Ne Ainu itak an ',so spell checker will not red dot many words also some Ainu words look like other foreign words. I open LocalDictionary and find it blank ,so I open TextEdit and open show spelling grammar 100 words out of 200 are red dotted !the others are not learned, so I press' learn' and it skips to some words not Allan after 100 it stops ,then I go to LocalDictionary and see all those words alphabetical order ,! great ! but what about the rest ? why does select half of the words and /part/ of a phrase/ 'Itak a-e-yay-/han-nok-kar-a' = to study language by oneself.

LocalDictionary spelling adding words
 
 
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