wo vs yo

wo

• A call to cause a horse to slow down or stop; whoa. 

• A falconer's call to a hawk. 

• A wall. 

yo

• An expression of surprise or excitement. 

• An interjection similar to hey. 

• A greeting similar to hi. 

• Present! Here! 

• Emphatic conclusion to a statement. 

• The letter Ё, ё. 

• third-person singular, familiar