The solution for level 17 of the game "What's the Word" is "CYAN." This color appears in each of the four picture clues, which share no other apparent connection to each other.
The alarm clock's plastic housing, the light emitted from the bulb, the fabric of the woman's pajamas and the first of the plastic cups all show cyan shades. Challenges in "What's the Word" rely on finding a common element such as this within a set of apparently disconnected images. Cyan is a color between blue and green which is used as a primary color in photography and image editing.