Had a plumber over to the house doing some work and he was quite amazed at how many rocks a person could accumulate and the different varieties. Turns out he had a small collection himself and brought them by so that I could identify them for him. I was blown away when he pulled out these 2 artifacts. He found them on his property near the Gaston / Lincoln Co. line. The best I can determine they are ground grooved axes from the late archaic period. I would love to hear more opinions, thanks.

Yes they are! They make a great pair.
You are correct, Late Archaic full-grooved axes.
The full-groove is the earliest form of stone axes.
The 3/4 goove and other modifications came later culminating in the grooveless celt form.
These guys are great together because you can get a good idea of the use-wear.
The smaller one was probably the same size as the larger one at one time.
Look at all the wear in the groove of the smaller one compared to the larger.
You can still see the "peck" marks in the groove of the larger one.
These guys were mainly used for chopping wood and building structures. Axe and hammer.

What was that plumbers name?

On page three of this artifacts section there is an old post on stone axeheads
that you might find worth reading. Most of the pictures are gone but there's still the text.
Titled; "Collection Entry 09, Axeheads, Celts and Blanks".