Hi, 1 kind (noun) 4 c : a doubtful or barely admissible member of a category < a kind of gray > 1 gray (adjective) 5 :having an intermediate and often vaguely defined position, condition, or character <an ethically gray area> This meaning of 'gray' as unclear, vaguely defined is the figurative meaning. The meaning in 'a kind of gray' above is the literal meaning, which is simply the colour. M-W defines this as Definition of GRAY 1 a : of the color gray You could just as easily say eg 'a kind of red' or 'a kind of blue'.
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