OUT is a hinge word: 23 words make a compound in front of it and 22 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 OUT.
Each of these makes a compound starting with OUT.
OUT is the busiest particle in English and the single most useful hinge to memorise. It sits behind verbs (BLACKOUT, WORKOUT, HANDOUT) and in front of almost anything (OUTLINE, OUTLAW, OUTBREAK, OUTDOOR).
These words make a compound whichever side of OUT they sit on, usually with two unrelated meanings.
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.
BLACK → OUT → BACK — blackout and outbackBREAK → OUT → BOARD — breakout and outboardBURN → OUT → BREAK — burnout and outbreakCHECK → OUT → CAST — checkout and outcastCUT → OUT → COME — cutout and outcomeFALL → OUT → DOOR — fallout and outdoorHAND → OUT → FIT — handout and outfitHANG → OUT → GOING — hangout and outgoingHIDE → OUT → HOUSE — hideout and outhouseKNOCK → OUT → LAW — knockout and outlawLAY → OUT → LET — layout and outletLOOK → OUT → LINE — lookout and outlineKEYSTONE 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 · OVER · SHIP · SIDE · SOME · TIME · WAY · WORK