basically any part can be. a common conjunction is "and." You can use and various ways. Verbs: "I like to swim and ski." Nouns: "I like cars and motorcycles." Adjectives: "She is pretty and smart."
Yes, conjunction is a part of speech.
its a conjunction
its a conjunction
it is a conjunction
Assuming you mean PART of speech (not ART), "or" is a conjunction.
Conjunction.
it is a conjunction
And is a conjunction.
'As' is both a preposition and a conjunction.
It is a conjunction
Noun.
"When" is an adverb. It can also be a conjunction.