scruff
Tough
Plough
Plough, Drought
Dough Though Plough
Breakthrough, clickthrough, feedthrough, readthrough, walkthrough,
enough
Tough
scruff
Buff Bluff Scruff
Rough, tough, enough.
The word "through" rhymes with "stew" and ends in -ough.
For words that rhyme with "tough" and end in "ough," you could consider "rough" or "slough." These words share a similar sound pattern.
Plough
Dough.
Plough, Drought
caught
Beau Blow Toe