,,Yellow.”
Every color seems to Ezra to be yellow as yellow is the answer to the questions referring to a known object like ball, shirt, cat: What color is this? Yellow is usually the answer.
I suspect the answer is yellow because some of his favorite machines are constructions vehicles which are usually shades of yellow, and I - we - have probably said yellow more than other colors. He does sometimes say blue is blue and only for objects that are blue and not yellow.
He knows adjectives. He now knows the difference between mom and grand mom though they are the color yellow or maybe blue.