IPA: //ˈsɪŋɡæs//
KK: /sɪŋgæs/
A type of gas made from carbon monoxide and hydrogen, often used as a fuel or in chemical processes.
The factory uses syngas to produce electricity and heat.
Syngas is a contraction of 'synthesis gas', where 'synthesis' comes from the Greek 'synthesis' (σύνθεσις, meaning putting together) and 'gas' comes from the Latin 'gas' (from the Greek 'khaos', meaning empty space). The term refers to a mixture of gases used to produce energy, created by putting together various feedstocks.
Think of 'putting together' ('synthesis') different gases to create a fuel source — that's what syngas is.
No commonly confused words.