ptarmigan

n bird of the grouse family, with black or grey feathers in summer and white feathers in winter 雷鸟（松鸡科鸟, 夏季羽毛呈黑色或灰色, 冬季呈白色）.

psychic, psychoanalyse, psychoanalysis, psychoanalyst, psychoanalytic, psychoanalytical, psychoanalytically, psychological, psychologically, psychologist, psychology, psychopath, psychopathic, psychosis, psychosomatic, psychosomatically, psychotherapist, psychotherapy, psychotic, PT, PTA, Pte, pterodactyl, PTO (also pto), Ptolemy, ptomaine, ptomaine poisoning, pub, pub crawl, puberty, pubic, public, public bar, public convenience, public garden, public house, public lending, public nuisance, public official, public opinion, public ownership,