polyethylene/poliʹethileen/ noun

• syndetic
• syndic
• syndicalism
• syndicate
• syndrome
• syne
• synecdoche
• synecology
• syneresis
• synergic
• synergism
• synergist
• synergy
• synesthesia
• syngamy
• synod
• synodic
• synodical
• synodic month
• synonym
• synonymous
• synonymy
• synopsis
• synopsize
• synoptic