Words That Rhyme With "Gynoecium" :

3 syllables:

cesium, Pepysian

4 syllables:

androecium, dysprosium, lutecium, lutetium, podetium, potassium, promethium, trapezium

5 syllables:

amphithecium, apothecium, cleistothecium, endothecium, epithecium, hypothecium, nemathecium, paramecium, perithecium