Heard spelling

gynoecum

Spelled gynoecium. the ending

Gynoecum or gynoecium?

Gynoecium. The ending is -ium, and the i is easy to lose because it barely gets a vowel of its own in speech.

The plural settles it: gynoecia.

Say

guy-NEE-see-um, and jy-NEE-see-um is heard just as often

Letters

G-Y-N-O-E-C-I-U-M