Picture

Frequently misused is the adverb awhile, being confused with the noun while. There's also the conjunction while, which can mean either “at the same time” (somewhat akin to simultaneously) or “whereas.”

A while ago, I stopped awhile 
To while away the day.
And then at rest, 'twas but a while,
A smile had come to stay.

Another “while,” conjunction style,
Not adverb, noun, or verb,
Doth neither calm nor tend to rile,
Though joining two in blurb.

When simultaneous those it pairs,
No need for comma “while.”
But if “whereas” instead it bears,
Then pause for single file.

“All cats and dogs have usual beats
While both will also prowl.
A cat may arch and hiss through teeth,
While dogs will bark and growl.”