Very early, an ESL student needs to learn the simple expression, "Ummmmm..." so that the other person will fill in the rest of the sentence. This facilitates conversations wonderfully! Equally handy are placeholder words such as "thingamajig", "gadget", "whatshisname", "doodad" and so on.
I found an entertaining beginning level video on "Camping in English", incorporating lots and lots of "stuff". This gave me a great basis for a "What to Say When You Don't Know the Word" lesson. Having creating the lesson in Edpuzzle, I've posted it on my Portfolio page.