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subway system

noun

• metro
• tube
• underground
• subway
• railroad
• railroad line
• railway
• railway line
• railway system

sounds kind of like

• sebastiana
• skipjack tuna
• soapstone
• space station
• space-time
• spaghettini
• speciation
• subjection
• subjugation
• subsection
• substation
• substitution
• subsystem
• subway station
• suffixation
• suffocation
• supposition