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

Signifying together, with

syn.

1. Synonym
2. Synthetic

• office-seekers
• official
• official birthday
• officialdom
• officialdoms
• officialese
• officialeses
• official family
• officialism
• officialisms
• officialities
• officiality
• official list
• official lists
• officially
• official receiver
• officials
• officialties
• officialty
• officiant
• officiants
• officiate
• officiated
• officiates
• officiating