myself, oneself

oneself / first-person pronoun: I, me (often shows the speaker's lower position in a hierarchy than the addressee) / (Kansai) you

self-realization

a photograph of oneself, a photographic self-portrait / (especially) a selfie

to take a photograph of oneself, to take a selfie

talking about oneself (especially, when the audience is not interested)

soul-searching

one's own concern or problem

(idiomatic) selfishness, self-centeredness

application (the use of a thing) / inflection (of a verb, conjugation; of an adjective or noun, declension)