What's the difference between reddle and ruddle?

Reddle

Definition:

• (n.) Red chalk. See under Chalk.

Example Sentences:

Ruddle

Definition:

• (v. t.) To raddle or twist.
• (n.) A riddle or sieve.
• (n.) A species of red earth colored by iron sesquioxide; red ocher.
• (v. t.) To mark with ruddle; to raddle; to rouge.

Example Sentences:

• (1) These assignments are consistent with published data (Ruddle, 1973).