fester
(of a wound or sore) to become worse, to ooze liquid
(of a negative feeling or a problem) become worse or more intense, especially through long-term neglect or indifference
(of food or garbage) to rot
flax
a plant that is cultivated for its seed (linseed) and for textile fiber made from its stalk
frogspawn
the eggs of a frog, which are surrounded by transparent jelly
rank
having a strong unpleasant smell
sods
grass and the part of the soil beneath it held together by its roots
swelter
to be uncomfortably hot
bluebottle
a common species of fly