"Already" is an adverb.
In general, adverbs tell you how something happens or is being done. Compare:
I have cleaned my bike.
I have already cleaned my bike.
"Already" is adding some detail to the cleaning, in other words to the verb.
All ready is an adverb because the word already is a future tense form of all ready. (already is an adverb.)
Previously is an adverb.
All numbers are adjectives.
The word probably is an adverb. It means in all likelihood.
'All' is the adjective.
"Everybody", "somebody", "anybody", and "nobody" are all indefinite pronouns.
The word all can be an adverb and a determiner. The adverb form is an intensifier whilst the determiner form is every individual of a class.
All numbers are adjectives.
All word in the English language have at least one part of speech. Contraptions is a noun, the plural form of contraption.
The word probably is an adverb. It means in all likelihood.
The word littlest is an adjective. It describes the smallest of all.
The word Delhi is a proper noun. All proper nouns are capitalised.
The word Europeans is a proper noun. All proper nouns are capitalised.
The word parallel is an adjective. It means to be equally distant at all points.
The word India is a proper noun. All proper nouns are capitalised.
The word Chinese is a proper noun. All proper nouns are capitalised.
it is a preposition
Gnat is a noun. All insects are things, which are nouns.
The word Cheryl is a proper noun. All proper nouns should be capitalised.