I know these are two distinctly (See, even MORE!) different words and the meanings and implications of each one are very stone cold distinctive (Right! another adjective relating to the first use as an adverb) and quite particular to the usage to me, but it seems as if there has been a movement lately to make words interchangeable by removing the importance of the differences of words' meanings.
What do these words mean to you?
For the first, most basic understanding, following with my very limited education (I am a high school drop out, remember) One is an adverb and the other is an adjective, so having both words is a necessity just to maintain a kind of language we have all agreed upon in an attempt to communicate with one another without rocks tied to the end of sticks for use as a period, for instance.
We NEED both words!