erstwhile is a valid English word

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

Meanings

Adverb (NOT COMPARABLE)

(archaic) Formerly; in the past.

Adjective (NOT COMPARABLE)

(literary legal or India) Former, previous.
• Synonym: former, once, previous, quondam, onetime, Thesaurus:former
(proscribed) Respected, honourable.

erstwhile is a Scrabble valid word

e1r1s1t1w4h4i1l1e1

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

erstwhile is an iScramble, QuickWords valid word

e1r2s3t4w5h6i7l8e9

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

Same letters words (Anagrams)

• WEHRLITES

Same letters plus one

• ERSTWHILES
• WESTERHILL
• WITHERELLS
• WITHERLESS

Same letters minus one

• THEILERS
• WEHRLITE
• WELSHITE
• WHETILES
• WHIRTLES
• WHISTLER
• WHITESEL
• WILSHERE