Here are the three different meanings. Loud is an adjective, it means making a lot of noise. Aloud is an adverb, it means to talk or shout in a voice loud enough to be heard. Loudly is also an adverb and means to speak making a lot of noise. Here is an example of each; I heard a loud bang and then saw black smoke,He read her letter aloud to the rest of the family and She spoke very loudly. I hope this helps you :)