Homophones:
* There are no perfect homophones for "grainy rough." Homophones are words that sound the same but have different meanings and spellings.
Synonyms:
* For "grainy": Coarse, gritty, textured, uneven, speckled
* For "rough": Uneven, bumpy, coarse, harsh, abrasive, rugged, unrefined, crude
Putting it together:
Since "grainy" and "rough" both describe a similar texture, you can use combinations of synonyms to describe something that is both grainy and rough. For example:
* Coarse and bumpy
* Gritty and uneven
* Textured and abrasive
The best choice depends on the specific context and the nuance you want to convey.