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Nail
A nail or other object used in tying the "Nail Knot"

Nail knot
A knot used to tie together two lines of significantly different diameters.

Nail-less knot
A knot used to tie the fly line backing to the butt-end of the fly line (substitute for the "Nail Knot")

Needle knot
Knot used to attach the leader to the fly line (alternate for the "Nail" or "Nail-less" Knots

Net
A small (16x24"), lightweight net often carried while fly fishing to assist in catching fish