It was an easy choice from the start, yellow is a colour, in any number of shades from very pale to very dark.
We have yellow egg yolks, yet another y word, and depending on whether the eggs are farmed in cages or free range can dictate the shade of yellow. Free-range gives the brightest yellow, by the way.
We have yellow cabs, but oddly enough these cabs are orange, not yellow as in this country, though the same may not be the case overseas, particularly in New York. Good thing they are bright yellow so you can see them coming if you are crossing the road, perhaps illegally.
We have yellow bananas and lemons, probably the most common answers when asked, what is yellow? That, and perhaps the yellow rose of Texas.
Then there is a more sinister meaning of the word, and it is associated with cowardice, and cowards are said to have a yellow streak down their backs.
If you have yellow fever then you are in a whole world of pain.
You can sometimes have what appears to be yellow skin, a sign of jaundice.
There is a yellow sea, and then there are the yellow pages, sometimes a substitute name for a telephone directory of businesses.
And lastly, an expression that comes out of the past, and not used so much these days, but people from Asia were thought to have yellow skin.