alternatively (adverb): is used to introduce an alternative idea.
by contrast (noun): is used to describe something opposite to a presented idea.
whereas (conjunction): similar to but or while.
hence (conjunction): for this reason.
in so far as (expression): is used to confirm and qualify an idea.
whenever (conjunction): is similar to when.
subsequently (adverb): is similar to consequently.
thus (conjunction): is used to describe a consequence.
furthermore (adverb): is used to describe additional information.
consequently (adverb): is used to describe a consequence.
This list of words function as classic adverbs nouns conjunctions. Follow the rules using these techniques.