cere / sear / seer / sere [si:r]
cere - n. – a waxy covering at the base of the upper beaks in some birds such as parrots and birds of prey
sear – n. & v. – n. – 1. a gunlock catch holding the hammer at half-cock or full-cock; v. – 1. burn or scorch; 2. brown meat at a high temperature; 3. leave a disturbing impression
seer – n. – a person with supernatural insight
sere – n. – 1. ecol. – a natural succession of plant or animal communities; 2. dried plants