FLU - Influenza.
FLY - Any insect of the order Diptera; characterized by having two wings, also called true flies.
LID - The top or cover of a container.
DILL - Anethum graveolens (the sole species of the genus Anethum), is a herb, the seeds of which are moderately warming, pungent, and aromatic, and were formerly used as a soothing medicine for children; also known as dillseed.
DULL - Lacking the ability to cut easily; not sharp.
FILL - To occupy fully, to take up all of.
FULL - Containing the maximum possible amount of that which can fit in the space available.
IDLY - In an idle manner.
LILY - Any of several flowers in the genus Lilium of the family Liliaceae, which includes a great many ornamental species.
DULY - In a due, fit, or becoming manner; as it ought to be; properly.
FLUID - Any substance which can flow with relative ease, tends to assume the shape of its container, and obeys Bernoulli's principle; a liquid, gas or plasma.
FULLY - In a full manner; without lack or defect.
DULLY - In a dull manner; without liveliness; without lustre.
FILLY - A young female horse.
IDYLL - Any poem or short written piece composed in the style of Theocritus's short pastoral poems, the Idylls.
FLUIDLY - In a fluid manner.