A compound word is formed by the union of two or more parts; as λογο-γράφο-ς
a. Compounds of three or more parts usually fall into two separate units; as βατραχο-μυ_ο-μαχία_
b. In a compound word two or more members are united under one accent; as in bláckberry contrasted with black berry. Most compounds in Greek, an inflected language, are genuine compounds, not mere word-groups such as are common in English, which is for the most part devoid of inflections.
c. Every compound contains a defining part and a defined part. The defining part usually precedes: εὐ-τυχής
Herbert Weir Smyth [n.d.], A Greek Grammar for Colleges; Machine readable text [info] [word count] [Smyth].