Black cherry? It could be a choke cherry. They have one seed inside and are dark redish purple. The leaves are sort of shiny as compared to other cherries like the pin cherry. They make good jam.
Smilax herbacea L. is most likely what you are looking at, or something within the same Smilax family. The berries hang from a single stem in a tight cluster resembling a dimpled golf ball. The berries begin as green clusters and ripen to a dark purple or black in the fall.
Rubus occendentalis or Black Cap Berries, are just blackberries, only just put down to a smaller size. They are dark violet/purple and have small berries growing on the stem.
Could it be the Mulberry tree
Could possibly be Callicarpa bodinieri (beauty berry)! Seven letters --E-T--
common dogwood
Border grass has purple berries. Another name for it is Liriope muscari. Keep the berries away from children and pets.
SalalA North American plant of the heath family, with clusters of pink or white flowers and edible purple-black berries.- Small evergreen shrub of Pacific coast of North America having edible dark purple grape-sized berries (wordnetweb.princeton.edu/perl/webwn)
It has small white flowers and purple berries and a poisonous purple root, it is a herb
blueberries are small round and blue juniper berries are purple berries that grows on a green spiky bush
Eastern red cedar is a evergreen tree that the female will develop small blue colored berries.
Black haw is a shrub or small tree with serrated oval leaves. Its white flowers and dark berries occur in clusters.
It's weed that is purple caused by the sunlight during the growing process