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I am wondering if there are any differences in the usage of `自己` and `自分`, or
are they simply synonyms?

It seems that the two are interchangeable with nouns stemming from them.

I.e, `非自己` and `非自分` also appear to be synonyms.
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2018-07-30T11:47:41.490
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2018-07-30T16:17:50.383
2018-07-30T12:07:20.577
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question
word-choice nuances nouns
Difference between 自己 and 自分
Synonyms. 自己 is a little bit formal/academic.
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2018-07-30T11:59:02.323
60551
2018-07-30T12:18:59.103
2018-07-30T12:18:59.103
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I'm pretty sure that the meaning is about 'self'. Now there are differences in
the two words. I myself am not really sure about all the little differences in
meaning of these two words. But I am pretty sure that in certain cases, it's
not interchangeable. So to answer your question, I would like to give you some
phrases about each one.

> 自分はそう思う。 _Methinks_
>
> 自分なりにやる。 _Do something in one's own way_
>
> 自分自身 _Me, myself_
>
> 両親のためではなく、自分のために勉強する _To study for myself not for my parents_
>
> 自分で決める _Decide it by myself_

* * *

> 自己紹介 _Introducing oneself_ I'm pretty sure they don't use 自分紹介
>
> 自己主義 自己中心 _Egoism, selfish_
>
> 自己宣伝 _To advertise oneself_
>
> 自己流 _Self-taught, one's own way_
>
> 自己批判 _Criticizing oneself_

So in conclusion the two are a bit like myself vs oneself/self. And some sites
said that it's the subjective self (自分 = I, me) vs objective self (自己,
oneself).

Also there are other words that you might be interested in too.

> [自我]{じが} (means _ego_ )、 [自]{みずか}ら means _himself/oneself_.

In fact, [自]{みずか}ら is a bit like himself. Sample sentences from Weblio:

> 彼は自らを[省]{かえり}みる _He reviews himself_
>
> 社長自ら[指揮]{しき}をとる _The CEO himself takes command of sth._
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2018-07-30T13:52:02.027
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2018-07-30T16:17:50.383
2020-06-17T08:18:27.500
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