TextEdit (Mac): How do I left- and right-align/separate two words on the same row?

How do I make a separation—in the middle of a row—where one part aligns to the left margin, and one part aligns to the right margin?

Here’s the thing: I wan’t to keep the parts on the same row; i.e. without having to place the two parts on different rows.

I have included a picture to illustrate exactly what I’m trying to do.