The wave stitch is a composite stitch that is made along two horizontal (guide) lines. First a series of short vertical stitches is made along the top line. Then a thread is woven through these stitches and stitched into the ground material, along the bottom line and in the middle between two of these stitches.
The wheatear stitch is a variation on the reverse chain stitch. It is made between two parallel lines, with V-shaped stitches between chain stitches.
Wholecloth quilt is a term used for a quilt that has a top with only one colour. Stitching is often applied to the top cloth, to create an intricate decorative pattern.
The whipped satin stitch is a composite stitch and a variation on the 'normal' satin stitch, where an area is filled with satin stitch, after which the total area is whipped in diagonal lines with a thread of a different colour, spaced a little apart.
Woven bars are used in Hardanger embroidery and (other) forms of drawn thread work. Warp/weft threads are removed, and the remaining weft/warp threads are combined into bars by weaving a thread over and under the bundles of remaining threads.
The zigzag coral stitch is made very much in the ame way as the coral stitch, but each stitch is worked diagonally across two parallel (guide) lines, creating a zigzag pattern with a knot at each end.
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The crossed corners cushion stitch consists of a square being formed by diagonal straight stitches, as a cushion stitch, followed by half of the square being overstitched by straight stitches being worked in the opposite direction.
The crossed buttonhole stitch is a variation on the 'normal' buttonhole stitch, whereby the vertical stitches are worked in an angle and cross each other in pairs.