Is the word lanes a noun?

Yes, "lanes" is a noun. It's the plural form of the noun "lane".

Here are some examples:

* The race car zoomed down the lanes of the track. (lanes refers to the specific paths on the track)

* There are three lanes of traffic on this highway. (lanes refers to the distinct sections of the road for vehicles)

* The bowling alley has ten lanes. (lanes refers to the areas where people bowl)