when is a valid English word

Scrabble validity: valid ( international - Sowpods, US - Twl06 )
iScramble validity: valid
QuickWords validity: valid

Meanings

Adverb (NOT COMPARABLE)

(interrogative) At what time? At which time? Upon which occasion or circumstance? Used to introduce direct or indirect questions about time.
• When will they arrive?
At an earlier time and under different, usually less favorable, circumstances.
• He's mister high and mighty now, but I remember him when.
(relative) At which, on which, during which: often omitted or replaced with that.
• That was the day when the Twin Towers fell.

Conjunction

At (or as soon as) that time that; at the (or any and every) time that; if.
• Pavlov's dogs salivate when [i.e. at any and every time that] they hear a bell.
During the time that; at the time of the action of the following clause or participle phrase.
• They dream when [i.e. during the time that] they sleep.
At what time; at which time.
• I am here till Friday, when [i.e. at which time] I leave for Senegal.

Pronoun

(interrogative) What time; which time.
• Since when do I need your permission?

Noun (COUNTABLE)

The time at which something happens.
• A good article will cover the who, the what, the when, the where, the why and the how.

Interjection

(often humorous) That's enough: a command asking someone to stop adding something, especially an ingredient or portion of food or drink; used in, or as if in, literal response to 'Say when'.
(obsolete) Expressing impatience. (Compare what.)

when is a Scrabble valid word

when

• International English (Sowpods) - The word is valid in Scrabble ✔
• US English (TWL06) - The word is valid in Scrabble ✔
• 00 points

when is an iScramble, QuickWords valid word

when

• The word is valid in iScramble ✔
• The word is valid in QuickWords ✔
• 00 points

Same letters words (Anagrams)

• HEWN

Same letters plus one

• CHEWN
• NEWAH
• NEWTH
• SHEWN
• WENCH
• WHEEN
• WHENS
• WHEYN
• WHINE

Same letters minus one

• HEN
• HEW
• NEH
• NEW
• NHE
• WEH
• WEN