Khaki can be a noun and an adjective. It's a noun because it's the name of a colour. It's an adjective because it can describe something, like a khaki uniform.
khaki
Khaki is green.
Yes khaki is green.
The part of speech for this particular word is a noun.
part of speech
The part of speech for "answer" is a noun.
what part of speech is beneath
adverb
The part of speech for "explicit" is an adjective.
The part of speech for "lecturer" is a noun.
The part of speech for "rapid" is an adjective.
The part of speech of "came" is a verb.