Difference between Water Nymph and Water Spider

WATER NYMPH vs WATER SPIDER: NOUN

(Greek mythology) any nymph of the water
A fairy that inhabits water
Submerged aquatic plant having narrow leaves and small flowers; of fresh or brackish water
A nymph, such as a naiad or Nereid, living in or near water.
A Naiad.
A plant of the genus Naias.
The water-lily, Castalia (Nymphæa).
Any dragon-fly.
A water lily having large leaves and showy fragrant flowers that float on the water; of temperate and tropical regions

A spider of the family Drassidæ, Argyroneta aquatica, which makes a bag of silk on water-plants, and lives in it under water as in a diving-bell, the opening being below, so that the air cannot escape. It is tilled by the spider, which brings down bubbles of air one at a time. See diving-spider, and cut under Argyroneta.
Any one of certain spiders of the lycosid genus Dolomedes, as D. tenebrosus, D. urinator, or D. sexpunctatus, which build nests of leaves and twigs on overhanging rushes, just at the surface of the water in shallow streams; a raftspider.
A water-mite or water-tick.
A bug of the genus Hydrometra; a water-measurer.
Diving bell spider

Of temperate and tropical regions
Of fresh or brackish water
A water lily (Nymphæa).
A goddess of any stream or other body of water, whether one of the Naiads, Nereids, or Oceanides.

Any spider that habitually lives on or about the water, especially the large American species (Dolomedes lanceolatus) which runs rapidly on the surface of water; -- called also raft spider.
A water mite.
An aquatic European spider (Argyoneta aquatica) which constructs its web beneath the surface of the water on water plants. It lives in a bell-shaped structure of silk, open beneath like a diving bell, and filled with air which the spider carries down in the form of small bubbles attached one at a time to the spinnerets and hind feet. Called also diving spider.

Water scorpion, Nereid, Nymphaea, Sterope, Water lettuce, Dryad, Blue lotus, Water shield, Greek deity, Nymph, Water sprite, Fragrant water lily, Pond lily, Nymphaea odorata, Naiad

Amphibiotic, Water monitor, Watermanship, Tongueless frog, Butterfly stroke, Water beetle, Water lettuce, Water flea, Natatorious, Water snake, Boat bug, Backswimmer, Water boatman, Water scorpion, Water bug

Break water, Roman deity, Water pepper, Water spider, Mermaid, Watermanship, Water scorpion, Nereid, Nymphaea, Sterope, Water lettuce, Dryad, Blue lotus, Greek deity, Nymph

Amphibiotic, Water monitor, Watermanship, Tongueless frog, Butterfly stroke, Water beetle, Water lettuce, Water flea, Natatorious, Water snake, Boat bug, Backswimmer, Water boatman, Water scorpion, Water bug

The Greek water nymph, Clytie, fell in love with the Sun God called Apollo.
The good news is, the high water nymph fishing has been great!
It's an alternative spelling for a water nymph or swimming nymph from Greek mythology.

My friend and I were swimming in my pool, and I dove down and I was pretty sure I saw a water spider.
Dolomedes aquaticus (water spider) put on a great display then submerged to watch the participants.