Sentence:  He was seeing , somehow , the <WSD>face</WSD> of a young boy , the boy Simms Purdew must once have been , a boy with sorrel hair , and blue eyes dancing with gaiety , and the boy mouth grinning trustfully among the freckles . 
Meaning of the word marked with <WSD> tags:  the front of the human head from the forehead to the chin and ear to ear