Above

·         Adverb. The Supreme-court of the state is above.

·         Preposition: A major is above a lieutenant.

·         Adjective. Read the above sentences and make them short.

·         Noun: John raised his medal above his head to show.

After

·         Adverb: Due to Covid-19, exam will held a week after.

·         Adjective: In after years the government set up a special allowance for widows.

·         Preposition: John returned after two decades. It is the sweetest fruit after mango.

·         Conjunction: John will come after he makes a plan. She finished the meal after I did.

All

·         Adjective: He works all the day honestly. You can take all the mangoes.

·         Adverb: John has travelled all around the globe to explore the world.

·         Pronoun:  All raised their hands in her favor. All are present except John.

·         Noun:  He lost his all when her mother died.

But

·         Adverb: John has but (only) one week to prepare for exams.

·         Preposition: John will not tell to anyone but (except) me.

·         Conjunction: John has no choice but to quit.  

·         Relative Pronoun: There is no one but likes him (who does not like him).

Down

·         Adverb. The road slops down to the city. John knocked down his opponent in a while.  

·         Preposition: Go down the road and turn right.

·         Adjective: Exchange rates are down today. The down train will arrive in one minute.

·         Noun: Ups and downs are the part of life.

·         Verb: Thunderstorm downed all the power lines in the town.

More words that fall in different parts of speech:

·         About: (Adverb, Preposition)

·         Any: (Pronoun, Adverb, Adjective)

·         Before: (Adverb, Preposition, Conjunction)

·         Better: (Noun, Verb, Adverb, Adjective)

·         Both: (Pronoun, Adjective, Conjunction)

·         Either: (Pronoun, Adjective, Conjunction)

·         Else: (Adverb, Adjective, Conjunction)

·         Enough: (Noun, Adverb, Adjective)

·         Even: (Verb, Adverb, Adjective,

·         Except: (Verb, Preposition, Conjunction)

·         For: (Preposition, Conjunction)

·         Less: (Noun, Adverb, Adjective)

·         Like: (Noun, Verb, Adverb, Adjective, Preposition)

·         Little: (Noun, Adverb, Adjective)

·         More: (Pronoun, Adverb, Adjective)

·         Much: (Pronoun, Adverb, Adjective)

·         Near: (Verb, Adverb, Adjective, Preposition)

·         Needs: (Noun, Verb, Adverb)

·         Neither: (Pronoun, Adjective, Conjunction)

·         Next: (Noun, Adverb, Adjective, Preposition)

·         No: (Noun, Adverb, Adjective)

·         Once: (Noun, Adverb, Conjunction)

·         One: (Noun, Pronoun, Adjective)

·         Only: (Adverb, Adjective, Conjunction)

·         Over: (Noun, Adverb, Preposition)

·         Right: (Noun, Verb, Adverb, Adjective)

·         Round: (Noun, Verb, Adverb, Adjective, Preposition)

·         Since: (Adverb, Preposition, Conjunction)

·         So: (Adverb, Conjunction)

·         Some: (Pronoun, Adverb, Adjective)

·         Still: (Noun, Verb, Adverb, Adjective)

·         Such: (Pronoun, Adjective)

·         That: (Pronoun, Adverb, Adjective, Conjunction)

·         The: (Adverb, Article)

·         Till: (Preposition, Conjunction)

·         Up: (Adverb, Adjective, Preposition)

·         Well: (Noun, Adverb, Adjective, Interjection)

·         What: (Pronoun, Adverb, Adjective, Interjection)

·         While: (Noun, Verb, Conjunction)

·         Why: (Noun, Adverb, Interjection)

·         Yet: (Adverb, Conjunction)