suますmasu
1.

To complete a task or obligation, ensuring that all necessary steps have been carried out without omission, thereby fulfilling expectations or requirements.

2.

To settle a matter in a manner that is deemed sufficient, even if it may not fully meet all standards or expectations, often accepting something less than ideal as a resolution.

3.

To bring an issue to a temporary resolution or closure, allowing for the perception that a problem has been resolved, despite potential underlying issues remaining unaddressed.

4.

To use a simple or substitute solution in order to conclude a situation swiftly, prioritizing expedience over thoroughness.

Example:

7時までに彼女は夕食を済ましてしまっているだろう。

narisuますmasunaりすますrisumasu
1.

To completely adopt the identity or role of another person, making it difficult for others to recognize the difference between the impersonator and the original individual.

2.

To pretend or act as if one possesses a certain identity or qualification, despite lacking genuine credentials or authority.

Example:

彼はその酒場で歯医者に成りすましていた。