What words have 2 in them?

This is a bit of a trick question! There are a few ways to interpret it:

* Words that contain the letter "2": There aren't many of these, but some examples are "two", "twelve", "twenty", and "second".

* Words that have a numerical meaning of "two": Here, we can look at words like "pair", "double", "duo", "couple", and "twin".

* Words that have a concept of "two" within their definition: This gets a bit broader. Words like "between", "both", "either", and "neither" all involve the idea of two things.

Let me know if you had a specific interpretation in mind, and I can give you a more tailored answer!