Two five-letter words have completely different pronunciations even though they share four letters and differ by only one vowel. Can you determine what they are?

HINTS:

1. Both words begin with C.

2. Both words end with R.

3. Both words contain two vowels.

4. The common vowel is "i".

5. The "i"" comes directly after the vowel that is different.

Answer:

The words are CHAIR and CHOIR.