Although both these words are pronounced the same (with final /s/ - neither with /z/), the former is the noun and the latter is the verb.
I'd like to do some practice now.
I'd like to practise now.
2) ADVICE / ADVISE
Advice /s/ is the noun, and advise /z/ is the verb.
If you wish good advice, consult an old man.
Her friends advised
her not to go out with such a quarrelsome guy.
N.B. These words do not mean warning/warn, but counsel, but counsel itself is a formal word (really literary when used as a noun) and is therefore better avoided in ordinary speech.
