What's the difference between riffler and ruffler?

Riffler

Definition:

• (n.) A curved file used in carving wool and marble.

Example Sentences:

Ruffler

Definition:

• (n.) One who ruffles; a swaggerer; a bully; a ruffian.
• (n.) That which ruffles; specifically, a sewing machine attachment for making ruffles.

Example Sentences:

• (1) Presumably they are due to changes in ribosomal proteins as characterized by Ruffler et al.