The word historian is a noun because a noun is a person, place, thing, idea, or quality. A historian is a person
The correct possessive form of "historian" is "historian's." This form indicates that something belongs to or is associated with a specific historian. For example, you might say, "The historian's research was groundbreaking."
The word painting can be a noun as in a piece of art. It can also be a verb where it is the present participle of paint.
historian
"Painter" is a noun. If a word ends in "-er" and the preceding letters spell a verb, the original word is almost always an "agency" noun.
Henry Adams
John L. O'Sullivan
You tell the history of ur class...duuh :P
part of speech
The part of speech for this particular word is a noun.
The part of speech for "answer" is a noun.
adverb
what part of speech is beneath
The part of speech for "explicit" is an adjective.
The part of speech for "twirl" is a verb.
The part of speech for "unfamiliar" is an adjective.
The part of speech of "came" is a verb.
The part of speech for "lecturer" is a noun.