An user Spanish
says…

Son
Auxiliary
  de color
  gris
Adjective
  oscuro
Adjective
  y
Coordinating conjunction
  su
Determiner
  base
Noun
  es
Auxiliary
  irregular
Adjective
.

They are dark grey and have an irregular base.
Words and sentences
New
son

New
de color

  1. colored (having a color)
  2. of color (of a race other than white)

New
gris

New
oscuro

  1. dark (lacking light)
  2. dark (of a color, deep in hue)
  3. obscure, incomprehensible
  4. suspicious, unclear

New
su

  1. Apocopic form of suyo his, her, its, one's, their, your (formal)
  2. Apocopic form of suyo his, her, its, one's, their, your (formal)
  3. Apocopic form of suyo (“your”)

New
base

New
es

New
irregular

  1. irregular, uneven, erratic, haphazard
  2. patchy, spotty, jagged, ragged
  3. fitful
  4. (of a verb etc.) irregular

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