αλληλοσκοτωμός
From LSJ
ἀπὸ τῶν καρπῶν αὐτῶν ἐπιγνώσεσθε αὐτούς → ye shall know them by their fruits, by their fruits ye shall know them, by their fruits you shall know them, you will know them by their fruit
ο αλληλοσκοτώνομαι
αμοιβαίος φόνος, αλληλοδαρμός, άγρια σύγκρουση (για άτομα ή ομάδες).