Shout, yell or scream?

'Shout' and 'yell' are synonyms that can be used when describing what someone does when they raise their voice extremely loud in order to be heard.

'Scream' is similar, but it adds another dimension to shouting or yelling: fear or excitement.

Examples:
-Stop yelling at me! I can hear you just fine.

-On the roller coaster, we were screaming our heads off.