STUMPERS XXIX

Can you think of a one-syllable, six-letter word that can have two of its letters switch positions to make another one-syllable word that rhymes with the original word?

HINTS:
1. The switched letters are S and C.
2. S _ _ _ C _

Answer:

The words are SOURCE and COURSE.

Credit: GAMES Magazine - Mar. 2014
Mildred K. Henderson