Is merchandise a noun

Yes, the Word 'merchandise' is both a noun and a verb.

The noun 'merchandise' is a Word for goods bought or sold.

The noun 'merchandise' is an uncountable (mass) noun, a type of aggregate noun, a Word representing an indefinite number of elements or parts.

Example sentences:

The merchandise in this shop is quite expensive. (noun)

This is the ad campaign to merchandise our new product. (verb)