Divide the words into two columns according to pronunciation of the underlined part

Here are the words divided into two columns based on the pronunciation of the underlined parts:

**Column 1 (pronounced as /θ/ as in "thief")**
- thief
- teeth
- leather
- thing
- mouth
- they
- through
- three
- think
- breathe
- that
- the
- this

**Column 2 (pronounced as /ð/ as in "father")**
- health
- smooth
- than
- other
- those
- either
- month
- breath
- width
- strength
- another
- uthor
- weatherman

Let me know if you need anything else!