The word work can be used as a noun, a verb, or an adjective.
Noun: My work is very difficult.
Verb. I work from 9 in the morning until 5 in the evening.
Adjective: We are having a work meeting this afternoon.
what part of speech is work
It is a command; do is in the imperative.
Work is a verb in that example.
noun
It depends on how you are using the word. Work can be a noun (He was late for work) and a verb (How do you work this thing). With an ending, it can also be an adjective (It was a working part).
Worked is a verb. It is the past tense of work
part of speech
The part of speech for this particular word is a noun.
what part of speech is beneath
adverb
It depends on how you are using the word. Work can be a noun (He was late for work) and a verb (How do you work this thing). With an ending, it can also be an adjective (It was a working part).
There is a possessive case pronoun. As usual for such pronouns, it functions as an adjective in the sentence.