1. Rise and Arise:

Rise: Move from a lower position to a higher one
Arise: Emerge; Occur

Sun/prices rise whereas situations/conflicts arise.


2. Professor and Lecturer:

A professor (higher rank) is tenured whereas a lecturer (lower rank) is not.


3. Elegy and Eulogy

An elegy is a poem, typically a lament for the dead whereas an eulogy is a piece of writing that praises someone who has just died.

__________________
Marwatone.