Etymology
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warder (n.)

c. 1400, "guardian of an entrance," from Anglo-French wardere, wardour "guardian, keeper, custodian" (Old French gardeor), agent noun from Old North French warder "to guard, keep, maintain, uphold" (Old French garder), from Frankish *wardon, from Proto-Germanic *wardon "to guard," from PIE *war-o-, suffixed form of root *wer- (3) "perceive, watch out for."

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*wer- (3)

Proto-Indo-European root meaning "perceive, watch out for."

It forms all or part of: Arcturus; avant-garde; award; aware; beware; Edward; ephor; garderobe; guard; hardware; irreverence; lord; panorama; pylorus; rearward; regard; revere; reverence; reverend; reward; software; steward; vanguard; ward; warden; warder; wardrobe; ware (n.) "manufactured goods, goods for sale;" ware (v.) "to take heed of, beware;" warehouse; wary.

It is the hypothetical source of/evidence for its existence is provided by: Latin vereri "to observe with awe, revere, respect, fear;" Greek ouros "a guard, watchman," horan "to see;" Hittite werite- "to see;" Old English weard "a guarding, protection; watchman, sentry, keeper."

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beef-eater (n.)
also beefeater, c. 1600 as a general contemptuous term for a well-fed menial; specifically as "warder of the Tower of London" from 1670s; the notion is of "one who eats (another's) beef" (see eater, and compare Old English hlaf-æta "servant," literally "loaf-eater").
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award (v.)
late 14c., "decide after careful observation," from Anglo-French awarder, from Old North French eswarder (Old French esgarder) "decide, judge, give one's opinion" (after careful consideration), from es- "out" (see ex-) + warder "to watch," a word from Germanic (see ward (n.)). Related: Awarded; awarding.
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guard (v.)

mid-15c., from guard (n.) or from Old French garder "to keep watch over, guard, protect, maintain, preserve" (corresponding to Old North French warder, see gu-), from Frankish *wardon, from Proto-Germanic *wardon "to guard" (from PIE root *wer- (3) "perceive, watch out for"). Italian guardare, Spanish guardar also are from Germanic. Related: Guarded; guarding.

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alectryomancy (n.)
"divination by means of a cock and grains of corn," 1680s, from -mancy "divination" + Latinized form of Greek alektryon "cock," literally "warder-off, fighter," related to alexein "to ward off, drive or keep off" (see Alexander, and compare Alekto, name of one of the three Furies). Perhaps originally a personal name, applied at first to the fighting cock, then to cocks generally. Earlier form of the word in English was alectoromancy (1650s). Letters of the alphabet were traced on the ground and a grain of corn was placed on each.
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wardrobe (n.)

early 14c., "room where wearing apparel is kept," earlier "a private chamber" (c. 1300), from Old North French warderobe, wardereube (Old French garderobe) "dressing-room, place where garments are kept," from warder "to keep, guard" (from Proto-Germanic *wardon "to guard," from suffixed form of PIE root *wer- (3) "perceive, watch out for") + robe "garment" (see robe (n.)). Meaning "a person's stock of clothes for wearing" is recorded from c. 1400. Sense of "movable closed cupboard for wearing apparel" is recorded from 1794. Meaning "room in which theatrical costumes are kept" is attested from 1711. Wardrobe malfunction is from 2004.

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reward (v.)

c. 1300, rewarden, "to grant, bestow;" early 14c. "to give as prize or compensation," from Anglo-French and Old North French rewarder "to regard, reward" (Old French regarder) "take notice of, regard, watch over." This is from re-, here perhaps an intensive prefix (see re-), + warder "look, heed, watch," from Frankish or some other Germanic language, from Proto-Germanic *wardon "to guard" (from PIE root *wer- (3) "perceive, watch out for").

Originally any form of requital, good or bad, for service or evil-doing. A doublet of regard (v.), reward was used 14c.-15c. in the senses now given to that word: "look at; care about; consider." Related: Rewarded; rewarding.

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