tdd is a valid English word

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

Meanings

Noun (COUNTABLE AND UNCOUNTABLE)

(software engineering) Initialism of: test-driven development.
• Coordinate terms: BDD
(telecommunications) Initialism of: telecommunications device for the deaf.

tdd is not a Scrabble valid word

tdd

• International English (Sowpods) - The word is not valid in Scrabble ✘
• US English (TWL06) - The word is not valid in Scrabble ✘
• 00 points

tdd is an iScramble, QuickWords valid word

tdd

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

Same letters words (Anagrams)

• DDT
• DTD

Same letters plus one

• ATDD
• DADT
• DDTS
• DFDT
• DFTD
• DTDP
• DTDS
• DTHD
• TCDD
• TDDS
• TEDD
• TIDD
• TODD

Same letters minus one

• DD
• DT
• TD