Following are all the quackgrass like words, in the list below.
COUCH GRASS
100% like quackgrass
DOG GRASS
100% like quackgrass
WITCHGRASS
100% like quackgrass
WITCH GRASS
99.99% like quackgrass
QUACK GRASS
99.99% like quackgrass
AGROPYRON REPENS
66.69% like quackgrass
QUICK GRASS
66.69% like quackgrass
QUITCH
33.37% like quackgrass
SCUTCH GRASS
33.37% like quackgrass
COUCH
33.37% like quackgrass
COUCH-GRASS
33.37% like quackgrass
QUITCHGRASS
33.37% like quackgrass
COUCHGRASS
33.37% like quackgrass
TWITCH
33.37% like quackgrass
SQUITCH GRASS
33.37% like quackgrass
TWITCHGRASS
33.37% like quackgrass
QUICKENS
33.37% like quackgrass
NEEDLEGRASS
33.37% like quackgrass
CLUBGRASS
33.37% like quackgrass
UMBRELLA GRASS
33.37% like quackgrass
DEVIL GRASS
33.37% like quackgrass
HAIR GRASS
33.37% like quackgrass
YARDGRASS
33.37% like quackgrass
COTTONGRASS
33.37% like quackgrass
QUICKEN
33.37% like quackgrass
CROWFOOTGRASS
33.37% like quackgrass
SPEARGRASS
33.37% like quackgrass
CALIFORNIA GRASS
33.37% like quackgrass
WILD OATS
33.37% like quackgrass
MIDGE GRASS
33.37% like quackgrass
FINGER GRASS
33.37% like quackgrass
SQUITCH
33.37% like quackgrass
VELVETGRASS
33.37% like quackgrass
SNAKE-GRASS
33.37% like quackgrass
PORCUPINE GRASS
33.37% like quackgrass
HOOKGRASS
33.37% like quackgrass
BLACK OAT GRASS
33.37% like quackgrass
WOOLGRASS BULRUSH
33.37% like quackgrass
GRASSWRACK
33.37% like quackgrass
MATGRASS
33.37% like quackgrass
CUTTY GRASS
33.37% like quackgrass
STAR GRASS
33.37% like quackgrass
YELLOW BRISTLE GRASS
33.37% like quackgrass
BIRDWEED
33.37% like quackgrass
BLACKGRASS
33.37% like quackgrass
COCKWEED
33.37% like quackgrass
RIBBONGRASS
33.37% like quackgrass
HARIALI GRASS
33.37% like quackgrass
MATWEED
33.37% like quackgrass
PANICGRASS
33.37% like quackgrass
PIGWEED
33.37% like quackgrass
REEDGRASS
33.37% like quackgrass
MEANS GRASS
33.37% like quackgrass
SIGNALGRASS
33.37% like quackgrass
SWITCH GRASS
33.37% like quackgrass
CORDGRASS
33.37% like quackgrass
HIPPO GRASS
33.37% like quackgrass
HERDS-GRASS
33.37% like quackgrass
GOOSEGRASS
33.37% like quackgrass
SLOUGHGRASS
33.37% like quackgrass
DEER'S GRASS
33.37% like quackgrass
ZOYSIAGRASS
33.37% like quackgrass
HAIRGRASS
33.37% like quackgrass
SQUIRREL GRASS
33.37% like quackgrass
SOURGRASS
33.37% like quackgrass
CUSA GRASS
33.37% like quackgrass
PUZZLEGRASS
33.37% like quackgrass
EAGRASS
33.37% like quackgrass
WATER COUCH
33.37% like quackgrass
GRASSWEED
33.37% like quackgrass
EELWRACK
33.37% like quackgrass
SHEEPGRASS
33.37% like quackgrass
STINKGRASS
33.37% like quackgrass
FESTUCA
33.37% like quackgrass
OATGRASS
33.37% like quackgrass
SCRUBGRASS
33.37% like quackgrass
BUFFALO GRASS
33.37% like quackgrass
RADIX GRAMINIS
33.37% like quackgrass
WIDGEON GRASS
33.37% like quackgrass
BEARGRASS
33.37% like quackgrass
FLYAWAY GRASS
33.37% like quackgrass
BASKETGRASS
33.37% like quackgrass
NEEDLE-AND-THREAD GRASS
33.37% like quackgrass
CLOVER GRASS
33.37% like quackgrass
CATCHWEED
33.37% like quackgrass
LOPGRASS
33.37% like quackgrass
PINEGRASS
33.37% like quackgrass
DRONKGRAS
33.37% like quackgrass
PLUME GRASS
33.37% like quackgrass
WIREGRASS
33.37% like quackgrass
CARNATION-GRASS
33.37% like quackgrass
BLUEBUNCH
33.37% like quackgrass
LOVE GRASS
33.37% like quackgrass
SOUR GRASS
33.37% like quackgrass
BUNNY GRASS
33.37% like quackgrass
TASSELWEED
33.37% like quackgrass
SHAVEGRASS
33.37% like quackgrass
SILVERGRASS
33.37% like quackgrass
RIBBONWEED
33.37% like quackgrass
BENTGRASS
33.37% like quackgrass
