A noun. It is derived from the verb "mark", of which it is the plural gerund.
part of speech
Adjective
What part of speech is thaw
The part of speech for oscillate is verb.
An adjective is a part of speech.
A question mark is a punctuation mark, not a part of speech. It is used at the end of a sentence to indicate that it is a question.
The word end mark is a noun. An end mark is a punctuation mark which appears at the end of a sentence.
the exclamation mark then the speech mark "will we ever see him again?"
In British English, speech marks generally go before the question mark. In American English, the placement can vary depending on whether the question mark is part of the quoted material. It's best to follow the style guide or preference of the publication you are writing for.
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
Mark Antony uses a subtle and eloquent tone in his speech. This is in contrast to the rational tone of Brutus's speech.
The part of speech for "explicit" is an adjective.
The part of speech for "twirl" is a verb.