Parts of Speech

Oblivion is a noun referring to the state of being unaware or unconscious of what is happening, or the state of being completely forgotten or destroyed. It names a state or condition.

Oasis is a noun referring to a fertile spot in a desert where water is found. It names a place or thing, not an action or description.

Obdurate is an adjective meaning stubbornly refusing to change one's opinion or course of action. It describes a person's character quality, similar to obstinate.

Obtain is a verb meaning to get, acquire, or gain possession of something. It expresses the action of getting something rather than naming it or describing its qualities.

Obedience is a noun referring to compliance with the commands or orders of a person in authority. It names the quality or state of being obedient.

Oath is a noun referring to a solemn promise, often invoking a divine witness, regarding one's future action or behavior. It names a type of declaration or promise.

Oblige is a verb meaning to require or compel someone to take a certain course of action, or to do something as a favor. It expresses the action of forcing or helping.

Obligation is a noun - it names a state or condition of being bound to do something. Verbs express actions (like 'oblige'), adjectives describe qualities (like 'obligatory'), and adverbs modify how things happen (like 'obligatorily'). Prepositions show relationships between words, which doesn't fit here.

'Noise' is a noun that refers to any loud, unpleasant, or unwanted sound. Nouns name people, places, things, or ideas. 'Noise' fits this definition perfectly as it names a type of sound. It cannot function as a verb, adjective, adverb, or preposition in this form.

'Nominal' means relating to names or nouns, or being something in name only. Adjectives describe or modify nouns by providing more information about them. 'Nominal' functions as an adjective when describing something as nominal (e.g., 'nominal fee,' 'nominal role'). It doesn't function as a verb, pronoun, adverb, or preposition.

'Nominate' is an action word meaning to propose someone for a position or office. Verbs express actions, occurrences, or states of being. 'Nominate' fits this definition as it describes the action of proposing someone (e.g., 'They nominated him for president'). It cannot function as a noun, adjective, adverb, or preposition.

'Nook' is a noun that refers to a small corner or recess, especially in a room. Nouns name people, places, things, or ideas. 'Nook' fits this definition as it names a specific type of physical space. The word cannot function as a verb, adjective, adverb, or preposition in this form.

'Non' is a prefix or adverb meaning 'not' or 'the opposite of' (as in 'non-existent,' 'non-stop'). When used as a standalone word, it functions as an adverb indicating negation. Adverbs modify verbs, adjectives, or other adverbs. 'Non' is not a verb, noun, pronoun, or preposition - it's an adverbial particle indicating negation.

'None' is a pronoun meaning 'not any' or 'no part/portion.' Pronouns take the place of nouns. In sentences like 'None of the students came' or 'I have none left,' 'none' functions as a pronoun referring back to a previously mentioned noun or quantity. It is not a verb, conjunction, interjection, or preposition.

'Neighbour' is a noun that refers to a person living next door or near to another. Nouns name people, places, things, or ideas. 'Neighbour' perfectly fits this definition as it names a type of person based on their location relative to others. The word cannot function as a verb, adjective, adverb, or preposition.