1. Belonging to them

Sounds like: there's

Encyclopedia: Theirs

• Gymnopilus spectabilis
• Gymnopilus validipes
• Gymnopilus ventricosus
• Gymnorhina
• Gymnorhina tibicen
• gymnosophical
• gymnosophist
• gymnosophy
• gymnosperm
• gymnosperm family
• gymnosperm genus
• Gymnospermae
• Gymnospermophyta
• gymnospermous
• gymnospermous tree
• gymnospermous yellowwood
• Gymnosporangium
• Gymnosporangium juniperi-virginianae
• Gymnura
• gymslip
• gynaec-
• gynaeco-
• gynaecocracy
• gynaecologic
• gynaecological