Language: Communication by voice in the distinctively human manner, using arbitrary sounds in conventional ways with conventional meanings; speech. Also, a body of words and the systems for their use common to a people who are of the same community or nation, the same geographical area, or the same cultural tradition.
Thinking: rational; reasoning: People are thinking animals. Thoughtful; reflective: Any thinking person would reject that plan. Thought; judgment, reflection: clear thinking.
Hope that helps!