Knight is a noun. More fully, it is a common noun (= improper noun).
adverb
what part of speech is work
i want to know what part of speech is camping
what part of speech is beneath
what part of speech is eleven
"Lost" is being used as an adjective to describe the knight in this sentence.
The part of speech for "answer" is a noun.
part of speech
The part of speech for this particular word is a noun.
adverb
what part of speech is work
what part of speech is beneath
The part of speech for "indefinite" is an adjective.
The part of speech for "buried" is a verb.
The part of speech for "rapid" is an adjective.
The part of speech for "twirl" is a verb.
The part of speech of "came" is a verb.