συ-

σῠ- • (sŭ-) occurs before ζ (z) and before σ (s) plus consonant

1. alternative form of σῠν- (sŭn-)

συ- • (sy-) or σύ-

1. alternative form of συν- (syn-)
   1. occurs before sibilants [s, z] (the [s] plus consonant)

      ζ - συν- (“together”) + ζητώ (“seek”) → συζητώ (“discuss”) /siziˈto/

      ζ - συν- (“co-”) + ζυγός (“burden”) → σύζυγος (“spouse”) /ˈsiziɣos/

      σκ - συν- (“together”) + σκέπτομαι (“think”) → συσκέπτομαι (“confer”) /siˈsceptome/

      compare to συσ- (sys-)

   2. occurs colloquially before [v, ɣ, ð, f, x, θ, ks, ps]

      δ - συν- (“together”) + δέντρο (“tree”) → σύδεντρο (“group of trees”) /ˈsiðendro/

      φ - συν- (“co-”) + φέρω (φέρον) (“bear, bring”) → συμφέρον (“the interest”) /simˈferon/ > colloquial συφέρο /siˈfero/

• and see: συν- (syn-)