Whats a word called that has two words in it?

Question

Like "mailman" mail is a separate word and man is a separate word. There's a special word for it but I can't remember it.

Answer 1

compound word

Answer 2

I told you mister
postman = post-man
milkman = milk-man
password = pass-word
username = user name

These type of words are called compound words

Chose me as the best answer

Answer 3

compound word, mister.