The word say is a verb.
Depends on how you are using it. If you were saying "The glorified _______," then it would be an adjective. if you were saying "He glorified ___________" it would be a verb.
So is an adverb in that sentence. It's modifying the adjective happy.
It is like a ball. One could argue that "like" is part of an adjective. Saying that "like a ball" is discribing "It".
The part of speech for this particular word is a noun.
part of speech
The part of speech for "answer" is a noun.
what part of speech is beneath
adverb
The part of speech for "explicit" is an adjective.
The part of speech for "lecturer" is a noun.
The part of speech for "rapid" is an adjective.
The part of speech of "came" is a verb.