Etymology
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cress (n.)

common name for a plant of the mustard family, Old English cresse, originally cærse, from Proto-Germanic *krasjon- (source also of Middle Low German kerse, karse; Middle Dutch kersse; Old High German kresso, German Kresse), from PIE root *gras- "to devour" (see gastric). It underwent a metathesis similar to that of grass. French cresson, Italian crescione are Germanic loan-words.

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water (n.2)

measure of quality of a diamond, c. 1600, from water (n.1), perhaps as a translation of Arabic ma' "water," which also is used in the sense "luster, splendor."

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water (n.1)
Origin and meaning of water

Old English wæter, from Proto-Germanic *watr- (source also of Old Saxon watar, Old Frisian wetir, Dutch water, Old High German wazzar, German Wasser, Old Norse vatn, Gothic wato "water"), from PIE *wod-or, suffixed form of root *wed- (1) "water; wet."

To keep (one's) head above water in the figurative sense is recorded from 1742. Water cooler is recorded from 1846; water polo from 1884; water torture from 1928. Linguists believe PIE had two root words for water: *ap- and *wed-. The first (preserved in Sanskrit apah as well as Punjab and julep) was "animate," referring to water as a living force; the latter referred to it as an inanimate substance. The same probably was true of fire (n.).

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water (v.)
Origin and meaning of water
Old English wæterian "moisten, irrigate, supply water to; lead (cattle) to water;" from water (n.1). Meaning "to dilute" is attested from late 14c.; now usually as water down (1850). To make water "urinate" is recorded from early 15c. Related: Watered; watering.
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water-moccasin (n.)
type of snake in the U.S. South, 1821, from water (n.1) + moccasin (q.v.).
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water-closet (n.)
"privy with a waste-pipe and means to carry off the discharge by a flush of water," 1755, from water (n.1) + closet (n.).
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rose-water (n.)

late 14c., "water tinctured with oil of roses by distillation," from rose (n.1) + water (n.1). Symbolic of affected delicacy or sentimentalism. Similar formation in Middle Dutch rosenwater, Dutch rozenwater, German Rosenwasser.

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hot water (n.)
c. 1400, literal; 1530s in figurative sense of "trouble." See hot (adj.) + water (n.1). Hot-water bottle is from 1895.
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water-ice (n.)
"sugared water, flavored and frozen," 1818, from water (n.1) + ice (n.).
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