SIDE is a hinge word: 12 words make a compound in front of it and 5 make one after it, so it can sit in the middle of a chain and hold two compounds together at once.
Each of these makes a compound ending in SIDE.
Each of these makes a compound starting with SIDE.
SIDE is pure position, so it will attach to almost any place word. ROADSIDE, BEDSIDE and SEASIDE run one way; SIDEWALK, SIDEKICK and SIDESHOW run the other.
Put any word from the first list in front and any word from the second behind, and you have a three-word chain in which both neighbouring pairs join. Here are some of them.
BACK → SIDE → ARM — backside and sidearmBED → SIDE → BOARD — bedside and sideboardDOWN → SIDE → KICK — downside and sidekickFIRE → SIDE → LINE — fireside and sidelineHILL → SIDE → WALK — hillside and sidewalkKEYSTONE is a free daily puzzle built entirely out of chains like these. You get the two ends and have to fill the two words in the middle. Three bridges a day, no account, no cookies.
Each of these has a page like this one. There is also an index of all 28.
BACK · BALL · BED · BOARD · BOOK · BREAK · DAY · DOWN · FALL · FIRE · GUN · HAND · HEAD · HOUSE · LAND · LIFE · LIGHT · MAN · NIGHT · OFF · OUT · OVER · SHIP · SOME · TIME · WAY · WORK