Merriam-webster's definition for here/there like a noun is "here"=this place, and "here" as an adverb "here"=to/In this particular put ; at this place. The entry then lists dozens of situations of this cluster of conditions from 1852 to 1942, and from Massachusetts to California. Regarding the popular wording "Look ahere," https://hilairet013cwy1.blogoscience.com/profile