Most commonly "so" is used as a coordinating conjunction.
Example: It was raining, so we played checkers all day.
The constructions on both sides of the conjuction (so) are complete thoughts (subject-verb-object).
So may also be used as an adverb.
Example: We had so many widgets that we had to buy more warehouse space.
In this case, so modifies many, which is an adjective, modifying the noun, widgets.
The part of speech that the word my is used as is an adjective.
It's an "action word", so it's a verb.
The Lord is so zealous for his law, that he will part with it for no man's sake.
A suffix changes a word's part of speech. For example, the word 'happy' is an adjective. But when you add a suffix, which is an ending, it can change the part of speech. Happily is an adverb. Happiness is a noun.
An adverb modifying the adjective "little"
It is not ANY part of speech, there is no such English word as "stroobly".
"Hallooh" is not a recognized English word, so it does not have an official part of speech. It may be a misspelling or variation of another word.
In the sentence given, "so" is an adjective.
The part of speech for this particular word is a noun.
The part of speech that the word my is used as is an adjective.
It's an "action word", so it's a verb.
"Stroobly" is not a recognized English word, so it does not have an associated part of speech. It may be a made-up or invented word with no defined grammatical classification.
Rhyme is a noun and so is scheme.
The part of speech for the word diplomacy is a noun.
H is a letter, not a word. To be a part of speech, it needs to be a word.
The part of speech for the word "boulevard" is a noun.
The part of speech for the word civilian is English grammar.