How do I specify “the word under the cursor” on VIM's commandline?

Question

I want to write a command that specifies \"the word under the cursor\" in VIM. For instance, let\'s say I have the cursor on a word and I make it appear twice. For instance, i

Answer 1

yiwP

yiw: Yank inner word (the word under the cursor). This command also moves the cursor to the beginning of the word.

P: Paste before the cursor.

You can then map the e.g.: < ALT > - D to this command:

:nmap < ALT >-D yiwP