We use both forms in British English – one is a verb (doing word) and the other a noun (thing).
Is it marinade or marinate?
This is the verb ‘to marinate’ something.
- I marinate this steak.
- This meat was marinated for 7 hours.
This is the noun ‘a marinade’.
- I have used this recipe for marinade for years.
- This marinade is rather strong.
One way of remembering this is that the word ‘noun’ comes before the word ‘verb’ in the dictionary; likewise ‘d’ comes before ‘t’, so the noun is ‘marinade’ and the verb is ‘marinate’.