"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.
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 subjects are part of speech for they are all nouns.
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.
Gnat is a noun. All insects are things, which are nouns.
it is a preposition
The word Japan is a proper noun. All proper nouns should be capitalised.
The word Martha is a proper noun. All proper nouns should be capitalised.
The word Cheryl is a proper noun. All proper nouns should be capitalised.
'All' is the adjective.
'would' is a verb and 'all' is an adjective.