There are three kinds of adverbs – Simple, Interrogative and Relative. The vast majority of adverbs belong to the first group; there are very few adverbs of the second and third types.
While is a subordinating conjunction. It usually introduces subordinating clauses of time. But sometimes while also expresses contrast.
It wasn’t such a pleasant journey as we thought it would be.
She is not such a fool as you think her to be.
No sooner … than
Conjunctions which are always used in pairs are called correlative conjunctions. Note that most correlative conjunctions are of the coordinating type.
Examples are: either…or, neither…nor, not only…but also…, not…but, though…yet, both…and, so…that etc.
A subordinating conjunction joins a subordinate clause and a main (principal) clause. The subordinate clause can be a noun clause or an adverb clause. Note that a subordinating conjunction is not used to connect an adjective clause to another clause.
There are two main kinds of conjunctions:
Coordinating conjunctions join two clauses or sentences of equal rank. Here both clauses are capable of being principal clauses if they appear as such in separate sentences.