The noun is always spelled “practice.” The spelling of the verb varies based on whether you're writing in UK or US English: In UK English, “practice” (with a “c”) is the noun and “practise” (with an “s”) is the verb.
The noun is always spelled “practice.” The spelling of the verb varies based on whether you're writing in UK or US English: In UK English, “practice” (with a “c”) is the noun and “practise” (with an “s”) is the verb.