Sounds

--aw(w), law, saw, draw--"simpler, flat-a use of the letter “w”,  connating a sense of human effort?

Compare: ma, pa

                  maw, paw

As usual, nuances of meaning change with social context and energy. For example,while still in the realm of effort and work with "awl," things start to change with "awe," and, most pointedly within the "youth" culture at present, "awesome." Enough associated energy can quickly turn the laborius into the "cool."

Compare, further, with the "deeper" long-e use of the same in "eew!" Narrowing, deepening, internalizing both the long e and the w. Connoting something less than danger; rather,  a combined sense of distaste and reflection, the degree and proportion of which are entirely dependent on tone. The long e sound's typical trajectory outward is snagged and pulled back in, and/or down, depending on the specific "orchestration" of one's mouth and throat muscles, providing the potential for a rich variety of meaning-sense.

The more literate might never be able to "hear" the eww without seeing, if only subliminally, the w. The less literate, if asked to spell the expression, might well write eu. Which brings up the speed factor. Like the teen-conventional  "awesome," "ewww" is a dish most properly served fast, in the aural sense. By point of comparison,if we slow it down,we might wind up with E.U., in a far different context the well-known, conventional designation for European Union with, of course, an utterly different cognitive effect.