syn- /sin-/, sy- /si-/, syl- /sil-/, sym- /sim-/ or sys- /sis-/

Signifying together, with

• Humist
• humite
• humites
• humlie
• humlies
• hummable
• hummaum
• hummed
• hummel
• hummel bonnet
• hummelled
• hummeller
• hummellers
• hummelling
• hummels
• hummer
• Hummer
• hummers
• humming
• humming ale
• hummingbird
• hummingbirds
• hummings
• humming-top
• humming-tops