The two words that make up the contraction let's are let and us.
let us
let us
The term for two words that make one word is a compound word.
There and have are the two words.
The two words 'who' and 'will' make up the contracted word 'who'll'.
what two words mafe up bash
go on
It is
Won't is will not.
You have.
The two words that make up the word Ecoregion are Ecological Region.
When you make two words into one word it is called a compound word. Some examples are highchair, driveway, and heatwave.