"Thwart" can be a verb, noun or preposition. Defined from the dictionary (which would be a much better, more direct source to use for any word):
As a verb: to prevent one from accomplishing something: "he never did anything to thwart his father"; "he was thwarted in his plans".
As a noun: a structural crosspiece forming a seat for a rower in a boat.
As a preposition: from one side to another side of; across: "a cloud spread thwart the shore".
The part of speech that the word my is used as is an adjective.
A suffix changes a word's part of speech. For example, the word 'happy' is an adjective. But when you add a suffix, which is an ending, it can change the part of speech. Happily is an adverb. Happiness is a noun.
for
it depends what word it is it could be any part of speech depending on the sentence
The word power is a noun. The plural form is powers.
The part of speech for this particular word is a noun.
The part of speech that the word my is used as is an adjective.
H is a letter, not a word. To be a part of speech, it needs to be a word.
The part of speech for the word civilian is English grammar.
The part of speech for the word diplomacy is a noun.
The word speech is a noun.
The part of speech for this particular word is a noun.
The word speech is a noun.
The word speech is a noun.
The word speech is a noun.
The word is thwart (prevent someone from doing something).
What "part of speech" is the word "said?"