All words are ideas that let us talk and write to each other about everything we think about and feel and want to do. The same way a great tree begins from a small acorn and grows over time, so do ideas and the words we use to describe them.
Most Hebrew words start with a seed of an idea that grows over time, too. By adding vowels and additional letters, we get more ideas that are related to the original word, but each one just a little different.
The three letters (Shin-Vet-Tav) make the root word “Rest”. Related words grow out of that root using the same three letters plus various prefixes (letters before it), suffixes (letters after it), and vowels. like ___ which means “Cessation” or _____ which means “Shabbat observance”..
By recognizing the root a word is built , you can understand the thread of its meaning. Words that share the same root have related meanings and are all connected in some way to the meaning of the root.