Crossword puzzle clue "major nuisances"

HEADACHE, a pain inside the head

ANT, a small industrious insect

BRAT, a badly behaved child

DELAY, to put off to a later time

DETOUR, to take an indirect route

FLY, to move through the air

GNAT, any small fly of the family Culicidae, of which the females are commonly bloodsuckers