Below you can see the front-view size comparison of the Olympus TG-5 and Olympus E-M10 III. The Olympus TG-5 is clearly the smaller of the two cameras. Its body is 9mm narrower, 18 mm shorter and 18 mm thinner than the Olympus E-M10 III.
The chart below depicts how two cameras compare with average dimensions of the cameras in their class.