Checking from 1479 adjectives:
blueviolet.red|blue.violetred
darkblue.violet|dark.blueviolet
darkgreen.yellow|dark.greenyellow
darkorange.red|dark.orangered
darkviolet.red|dark.violetred
firsthand.some|first.handsome
greenyellow.green|green.yellowgreen
grimy.early|grim.yearly
lightblue.violet|light.blueviolet
lightgoldenrodyellow.green|lightgoldenrod.yellowgreen
lightgreen.yellow|light.greenyellow
lightyellow.green|light.yellowgreen
limegreen.yellow|lime.greenyellow
mediumblue.violet|medium.blueviolet
navyblue.violet|navy.blueviolet
palegreen.yellow|pale.greenyellow
royalblue.violet|royal.blueviolet
secondhand.some|second.handsome
slimy.early|slim.yearly
steelblue.violet|steel.blueviolet
superb.elated|super.belated
superb.old|super.bold
superb.right|super.bright
yellowgreen.yellow|yellow.greenyellow