Shrewd vs Shrewder - What's the difference?

shrewd | shrewder |

As adjectives the difference between shrewd and shrewder

is that shrewd is showing clever resourcefulness in practical matters while shrewder is (shrewd).

Shrewder vs Shredder - What's the difference?

shrewder | shredder |

As an adjective shrewder

is (shrewd).

As a noun shredder is

a machine that tears up objects into smaller pieces, especially a paper shredder or garbage shredder.