Grey-headed Woodpecker

Male - darkish-green above; crimson forehead; black hind-crown, faint crest and nape; dark sides of head and black malar stripe; yellow rump, white barred dark wings and blackish tail; unmarked, dull greyish-olive underbody diagnostic.
Female - black from forehead to nape, no crimson.
Photo taken at Sattal, Uttarakhand, India