1. (noun) a shout to attract attention

• call
• cry
• outcry
• shout
• vociferation
• yell

2. (verb) urge on with shouts

• egg on
• incite
• prod

3. (verb) shout halloo', as when greeting someone or attracting attention

• call
• cry
• holler
• hollo
• scream
• shout
• shout out
• squall
• yell