Loud / aloud / allowed

‘Loud’ is an adjective and means to make a lot of noise.
Turn the music down, it is so loud.
And it can also refer to bright clothes.
Wow, look at his shirt, it sure is loud.

‘Aloud’ is an adverb and means to speak out, so you can be heard.
The teacher told the students to read aloud.

And ‘allowed’ is a verb meaning to have permission.
We are not allowed to ride our bikes in there, look at the sign on the gate.

Flickr CC: Sam Leighton