#skullcap  rounded brimless cap fitting the crown of the head
  supertype:  cap  a tight-fitting headdress
  subtype:  beanie__beany  a small skullcap; formerly worn by schoolboys and college freshmen
  subtype:  coif  a skullcap worn by nuns under a veil or by soldiers under a hood of mail or formerly by British sergeants-at-law
  subtype:  yarmulke__yarmulka__yarmelke  a skullcap worn by religious Jews (especially at prayer)

No statement uses or specializes skullcap; click here to add one.