Which synonym can be used for grimace?

Here are some synonyms for grimace, depending on the specific nuance you want to convey:

General synonyms:

* Wince

* Scowl

* Frown

* Twitch

* Pucker

* Sneer

* Scrunch up

* Contort

Synonyms emphasizing pain/disgust:

* Cringe

* Writhe

* Glower

Synonyms emphasizing disapproval:

* Scoff

* Snort

The best synonym to use will depend on the specific context of your sentence.