Some questions about Japanese vocabulary

Hello,I am very interested in Japanese language and I am studing it since five years ago.

I have some questions about vocabulary.One month ago, I read on Wikipedia and there was written that words "Uma" (horse) and "Anzu" (apricot) are the words of Chinese origin that have been changed during centuries and that have been assimilated into the Japanese Native KUN vocabulary.

I would like to know if exist native Japanese word for "horse" and "apricot"?

And my other question is what Kanji to use for writing these words -pittari, keredo, kara (from) and mou (already)?

Tsurugi said:

And my other question is what Kanji to use for writting these words-pittari,keredo,kara(from) and mou(already)?

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I have never seen any of those words written in kanji. "kara" and "mou" may have been written in kanji 1000 years ago, but "keredo" derives from an inflectional ending + particle, both of which were usually left unwritten in all-kanji works.
And just a guess, but I think "pittari" is a comparatively recent word (as in, last few centuries), and doesn't have a kanji writing.