Converts N-acetylglucosamine (GlcNAc), a major component of complex carbohydrates, into GlcNAc 6-phosphate. Also has ManNAc kinase activity (By similarity). ATP + N-acetyl-D-glucosamine = ADP + H(+) + N-acetyl-D-glucosamine 6-phosphate Homodimer. Belongs to the eukaryotic-type N-acetylglucosamine kinase family. Truncated N-terminus.