Word search can be done in 2 ways.
Generate one from the web and ask students to work on it. Set a timer and they have to search for words within that time.
Or ask students to make one on their own and set loose their creativity!
There are several websites where word-search can be designed. For example, click hereTakes very little time for the teacher to design one and is a great tool for remembering the words in Maths.