Just keep making the biggest word smaller (re-visualize after each change) until all the words are more or less equal. For example you can use this technique to make all words the same size. Therefore you can reduce the size of the biggest word in the edit mode thus making all other words proportionally smaller. HINT: Words in your word artwork cannot be bigger than the biggest word (first in the words table). You can also switch to the edit mode and change the size of a word directly.Then close the options dialog and re-visualize your word art. If you want words sizes to be more precise according to the values in the size column then click on the options button in the words section and choose 'use size column' for the size parameter.You can also change a word's size value, but by default it will only have impact on its position in the table. Words are placed from top to bottom, therefore the closer a word to the top, the bigger it will be. Use up / down buttons in the words section to change its position.On Shape Format or Drawing Tools Format, select Text Fill or Text Outline, and pick the color you want. Change the color Select the WordArt text to change. Note: To convert existing text to WordArt, select the text, and then select Insert > WordArt. There are 3 options to change the size of a word: Go to Insert > WordArt Pick the WordArt style you want.

Google docs how to add word art