Following are all the blacken like words, in the list below.
NIGRIFY
100% like blacken
SCORCH
99.97% like blacken
BLACK
99.9% like blacken
CHAR
99.9% like blacken
MELANIZE
99.8% like blacken
TAR
74.88% like blacken
UNDERMINE
74.87% like blacken
DENIGRATE
74.79% like blacken
DEFAME
74.76% like blacken
DEMONISE
74.57% like blacken
DARKEN
50.03% like blacken
TARNISH
50.03% like blacken
BESMIRCH
50.03% like blacken
WHITEN
50.03% like blacken
BURNISH
50.03% like blacken
DISFIGURE
50.03% like blacken
DISCOLOUR
50.03% like blacken
REDDEN
50.03% like blacken
EFFACE
50.03% like blacken
CARBONIZE
50.03% like blacken
WEAKEN
50.03% like blacken
OXIDIZE
50.03% like blacken
SULLY
50.03% like blacken
SICKEN
50.03% like blacken
SMIRCH
50.03% like blacken
TARNISHING
50.03% like blacken
DISCOLOR
50.03% like blacken
BURN
50.03% like blacken
SEARED
50.03% like blacken
SOFTEN
50.03% like blacken
SHRIVEL
50.03% like blacken
SMEAR
50.03% like blacken
EXPOSE
50.03% like blacken
DISCREDIT
50.03% like blacken
TARNISHED
50.03% like blacken
TARNISHES
50.03% like blacken
DEGRADE
50.03% like blacken
OBLITERATE
50.03% like blacken
THREATEN
50.03% like blacken
INCINERATE
50.03% like blacken
CORRODE
50.03% like blacken
DISINTEGRATE
50.03% like blacken
COARSEN
50.03% like blacken
VILIFY
50.03% like blacken
SULLYING
50.03% like blacken
OXIDISE
50.03% like blacken
PIERCE
50.03% like blacken
CONTAMINATE
50.03% like blacken
SULLIED
50.03% like blacken
DISTORT
50.03% like blacken
FLAY
50.03% like blacken
SHARPEN
50.03% like blacken
BURNT
50.03% like blacken
HARDEN
50.03% like blacken
DISCOLOURS
50.03% like blacken
FLATTEN
50.03% like blacken
DEFACE
50.03% like blacken
DEBASE
50.03% like blacken
ASSAIL
50.03% like blacken
MALIGN
50.03% like blacken
DESTROY
50.03% like blacken
DESICCATE
50.03% like blacken
FADE
50.03% like blacken
IRRITATE
50.03% like blacken
DESPOIL
50.03% like blacken
EMBITTER
50.03% like blacken
ADULTERATE
50.03% like blacken
HUMILIATE
50.03% like blacken
INJURE
50.03% like blacken
SMOLDER
50.03% like blacken
VANISH
50.03% like blacken
DARKENS
50.03% like blacken
DEMEAN
50.03% like blacken
PETRIFY
50.03% like blacken
ENGULF
50.03% like blacken
CRISPEN
50.03% like blacken
SEAR
50.03% like blacken
BESMIRCHING
50.03% like blacken
INCRIMINATE
50.03% like blacken
DENUDE
50.03% like blacken
BURRY
50.03% like blacken
ENFLAME
50.03% like blacken
PUTREFY
50.03% like blacken
SMOULDER
50.03% like blacken
BESMIRCHED
50.03% like blacken
VAPORISE
50.03% like blacken
LACERATE
50.03% like blacken
IMMOLATE
50.03% like blacken
EXTINGUISH
50.03% like blacken
INFLAME
50.03% like blacken
BECLOUD
50.03% like blacken
SATURATE
50.03% like blacken
ROUGHEN
50.03% like blacken
BRIGHTEN
50.03% like blacken
DIMINISH
50.03% like blacken
EXPUNGE
50.03% like blacken
EMBARRASS
50.03% like blacken
OSTRACISE
50.03% like blacken
DEVASTATE
50.03% like blacken
DISOWN
50.03% like blacken