How do you say practice in Japanese?
google says れんしゅ but I want to check that first. thanks!

Question

Answer

not れんしゅ
it is 練習（れんしゅう）
You have to add "う"

Answer

Yes, that is correct.

練習 would be how it would look like in kanji.

練習したいです = I want to practice.

Answer

練習　「れんしゅ」is the noun - practice. It is a する　verb, so れんしゅする　means to practice.