Reincarnation.... Transmigration..... Rebirth..... And what not so confusing (● ̄(エ) ̄●)
I differentiate them like this:
Reincarnation -> MC starts from baby and remember their life in different timeline/universe; or MC remembers their past life without losing their present memory.
Rebirth -> MC start again from baby in the same timeline & universe. (I'm not really sure about this one)
Transmigration -> MC's soul enters an empty body in different universe without the memories of the body they took over.
Isekai -> MC enters different timeline or universe with their own body & soul, usually as a teenager or an adult.
Who is Ju-in? Σ(  ̄□ ̄||)
The orange haired boy
Ohh yaa thanks (⌒▽⌒)