Abbott-Smith Manual Greek Lexicon
βοάω (G994)
12 βοάω , -ῶ ( βοή ), [in LXX chiefly for זעק , צעק , קרא ;] absol., to cry, call out : Mt 3:3 , 27:46 , Mk 1:3 15:34 , Lk 3:4 9:38 18:38 , Jo 1:23 , Ac 8:7 17:6 25:24 , Ga 4:27 . C. dat., to call on for help (Heb. זעק על , Ho 7:14 , al.), Lk 18:7 .† SYN. : καλέω , to call, invite, summon ; κράζω , to cry , harshly or inarticulately, as animals; κραυγάζω , intensive of κράζω . βοάω expresses emotion, whether joy, fear, etc.
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain