Accentuation of Compound Nouns

128. The accent generally falls on the last syllable of the prefixed stem, or if that is impossible, then as far back as possible.

χρυσό-θρονος
ἀελλό-πος
ἐπ-ήρατο-ς (ἐρατό-ς)
αἰν-αρέτη-ς (ἀρετή), etc.

The chief exceptions are the fοllοwing.

1. When the second stem ends in -ο and has the force of an active participle, it is oxytone, or, if the penult is short, paroxytone.
   

   ὑ-φορβό-ς
   δημιο-εργό-ς
   τοξο-φόρο-ς

   Except compounds with prepositions as

   ἐπί-κλοπο-ς
   πρό-μαχο-ς
   ὑπό-τροπο-ς

   also those in -οχο-ς, and one or two more, πτολί-πορθο-ς, ἀγχί-μολο-ν, ἱππό-δαμος.

2. Adjectives in -της (stems in -εσ), nouns in -ευ-ς, nouns of the agent in -τηρ and -τη-ς, and abstract nouns in -η and -ιη retain their accent.
    
   • οἰνο-βαρής
      
   • ἡνι-οχεύ-ς
      
   • μηλο-βυτῆρ-ας
      
   • ἱππο-κορυστή-ς
      
   • ἐπ-ιωγή
      
   • ἁρμα-τροχιή
      
   • ἀλαοσκοπιή

   But a few adjectives in -της are barytone, as

   ὑψι-πέτης
   ποδ-ώκης
   χαλκ-ήρης
   τανυ-ήκης

   also the feminine forms ἠρι-γένεια, ληϊ-βότειρα, δυσ-αριστο-τόκεια, μισγ-άγκεια.

3. When the second stem is a long monosyllable, it is accented.
   

   βου-πλήξ
   ἀπο-ρρώξ
   παρα-βλῶπ-ες
   παρα-πλῆγ-ας
   ἀ-βλής, etc. (§ 125.2).

   Hence the feminine forms βο-ῶπ-ι-ς, γλαυκ-ῶπ-ι-ς, etc., (as if from βο-ώψ, γλαυκ-ώψ, etc.).