"Collector car?"

This morning I took Nathan on a little walk up to 11th and Lawton to pick up my car (parking is a bear if you don't get lucky).  On the way up the hill, Nathan and I talked about what we were seeing.

"That's a car."  He chirped.  "That's a tree, papa."

When we came across something he didn't know the name of yet, he would ask me in his usual way, saying "that's call?"

We came across a pick-up truck parked in the middle of the street, unloading some tools at a construction site.

"That's call?" said Nathan.  Then, without waiting for me to answer, he ventured a guess...  "That's call "collector car."" he said.

Pick-up truck... collector car.  Same difference?