Connectors
They are grammatical elements which connect or join.
Coordinate Conjunctions
Correlative Conjunctions
Conjunctive Adverbs
and
or
nor
but
for
so
yet
either-or
neither-nor
both-and
not only-but also
futhermore
however
as a result
in addition
therefore
words
phrases
clauses
sentences
independent
dependent
It is positioned in the middle
Some dependent clauses it is permissible to omit the subordinator.
Subordinators
It introduces an item which is less important.