Paired Conjuction

Definition:

A paired conjuction (such as not only . . . but also) that links balanced words, phrases, and clauses.

The elements connected by correlative conjunctions are usually parallel--that is, similar in length and grammatical form. Each element is called a conjoin.

These are the primary correlative conjunctions in English:
both . . . and
either . . . or
neither . . . nor
not . . . but
not only . . . but also

Other pairs that sometimes have a coordinating function include the following:
as . . . as
just as . . . so
the more . . . the less
the more . . . the more
no sooner . . . than
so . . . as
whether . . . or 

Example for paired conjuction:

• Both Mr. Parker and Mr. Stark will come to her party.

• If you can’t go to school, try either calling our teacher or sending him a letter.

• I have neither been there nor done that

• Not only does he write his papers at 3:00 am, but he also studies for exams at that time

Source:

http://grammar.about.com/od/c/g/correlaconhterm.htm