Javascript Select Text On Mouseover

I want to be able to select a word when I highlight over any part of
the word. When I say select the word, I want it to be highlighted as
if I left clicked my mouse and dragged the cursor along the word. I
want to do this so a user when putting the mouse over the word can
quickly hit <ctrl>c to copy the word, without having to manually
highlight the word.

This will be used multiple times in the script for specific words, not
for every word in the script. For example:

User Password
------- ---------------
admin adminUser
dba sysDbAPa$$

So in my above example when mousing over either of the passwords, the
entire password would be highlighted so I can quickly copy it.