Sentence:  I have more than once sat cross-legged in the grass through a long summer morning and watched without touching while a poppy bud higher than my <WSD>head</WSD> slowly but visibly pushed off its cap , unfolded , and shook out like a banner in the sun its flaming vermilion petals . 
Meaning of the word marked with <WSD> tags:  the upper part of the human body or the front part of the body in animals; contains the face and brains